Y belongs. Mathematical signs
“Symbols are not only recordings of thoughts,
a means of depicting and consolidating it, -
no, they influence the thought itself,
they... guide her, and that’s enough
move them on paper... in order to
to unerringly reach new truths.”
L.Carnot
Mathematical signs serve primarily for precise (unambiguously defined) recording of mathematical concepts and sentences. Their totality in real conditions of their application by mathematicians constitutes what is called mathematical language.
Mathematical symbols make it possible to write in a compact form sentences that are cumbersome to express in ordinary language. This makes them easier to remember.
Before using certain signs in reasoning, the mathematician tries to say what each of them means. Otherwise they may not understand him.
But mathematicians cannot always immediately say what this or that symbol they introduced for any mathematical theory reflects. For example, for hundreds of years mathematicians operated with negative and complex numbers, but the objective meaning of these numbers and the operation with them was discovered only at the end of the 18th and beginning of the 19th centuries.
1. Symbolism of mathematical quantifiers
Like ordinary language, the language of mathematical signs allows the exchange of established mathematical truths, but being only an auxiliary tool attached to ordinary language and cannot exist without it.
Mathematical definition:
In ordinary language:
Limit of the function F (x) at some point X0 is a constant number A such that for an arbitrary number E>0 there exists a positive d(E) such that from the condition |X - X 0 | Writing in quantifiers (in mathematical language) 2. Symbolism of mathematical signs and geometric figures. 1) Infinity is a concept used in mathematics, philosophy and science. The infinity of a concept or attribute of a certain object means that it is impossible to indicate boundaries or a quantitative measure for it. The term infinity corresponds to several different concepts, depending on the field of application, be it mathematics, physics, philosophy, theology or everyday life. In mathematics there is no single concept of infinity; it is endowed with special properties in each section. Moreover, these different "infinities" are not interchangeable. For example, set theory implies different infinities, and one may be greater than the other. Let's say the number of integers is infinitely large (it is called countable). To generalize the concept of the number of elements for infinite sets, the concept of cardinality of a set is introduced in mathematics. However, there is no one “infinite” power. For example, the power of the set of real numbers is greater than the power of integers, because one-to-one correspondence cannot be built between these sets, and integers are included in the real numbers. Thus, in this case, one cardinal number (equal to the power of the set) is “infinite” than the other. The founder of these concepts was the German mathematician Georg Cantor. In calculus, two symbols are added to the set of real numbers, plus and minus infinity, used to determine boundary values and convergence. It should be noted that in this case we are not talking about “tangible” infinity, since any statement containing this symbol can be written using only finite numbers and quantifiers. These symbols (and many others) were introduced to shorten longer expressions. Infinity is also inextricably linked with the designation of the infinitely small, for example, Aristotle said: Infinity in most cultures appeared as an abstract quantitative designation for something incomprehensibly large, applied to entities without spatial or temporal boundaries. 2) A circle is a geometric locus of points on a plane, the distance from which to a given point, called the center of the circle, does not exceed a given non-negative number, called the radius of this circle. If the radius is zero, then the circle degenerates into a point. A circle is the geometric locus of points on a plane that are equidistant from a given point, called the center, at a given non-zero distance, called its radius. 3) Square (rhombus) - is a symbol of the combination and ordering of four different elements, for example the four main elements or the four seasons. Symbol of the number 4, equality, simplicity, integrity, truth, justice, wisdom, honor. Symmetry is the idea through which a person tries to comprehend harmony and has been considered a symbol of beauty since ancient times. The so-called “figured” verses, the text of which has the outline of a rhombus, have symmetry. We - (E.Martov, 1894) 4) Rectangle. Of all geometric forms, this is the most rational, most reliable and correct figure; empirically this is explained by the fact that the rectangle has always and everywhere been the favorite shape. With its help, a person adapted space or any object for direct use in his everyday life, for example: a house, room, table, bed, etc. 5) The Pentagon is a regular pentagon in the shape of a star, a symbol of eternity, perfection, and the universe. Pentagon - an amulet of health, a sign on the doors to ward off witches, the emblem of Thoth, Mercury, Celtic Gawain, etc., a symbol of the five wounds of Jesus Christ, prosperity, good luck among the Jews, the legendary key of Solomon; a sign of high status in Japanese society. 6) Regular hexagon, hexagon - a symbol of abundance, beauty, harmony, freedom, marriage, a symbol of the number 6, an image of a person (two arms, two legs, a head and a torso). 7) The cross is a symbol of the highest sacred values. The cross models the spiritual aspect, the ascension of the spirit, the aspiration to God, to eternity. The cross is a universal symbol of the unity of life and death. 8) A triangle is a geometric figure that consists of three points that do not lie on the same line, and three segments connecting these three points. 9) Six-pointed Star (Star of David) - consists of two equilateral triangles superimposed on one another. One version of the origin of the sign connects its shape with the shape of the White Lily flower, which has six petals. The flower was traditionally placed under the temple lamp, in such a way that the priest lit a fire, as it were, in the center of the Magen David. In Kabbalah, two triangles symbolize the inherent duality of man: good versus evil, spiritual versus physical, and so on. The upward-pointing triangle symbolizes our good deeds, which rise to heaven and cause a stream of grace to descend back to this world (which is symbolized by the downward-pointing triangle). Sometimes the Star of David is called the Star of the Creator and each of its six ends is associated with one of the days of the week, and the center with Saturday. 10) Five-pointed Star - The main distinctive emblem of the Bolsheviks is the red five-pointed star, officially installed in the spring of 1918. Initially, Bolshevik propaganda called it the “Star of Mars” (supposedly belonging to the ancient god of war - Mars), and then began to declare that “The five rays of the star mean the union of the working people of all five continents in the fight against capitalism.” In reality, the five-pointed star has nothing to do with either the militant deity Mars or the international proletariat, it is an ancient occult sign (apparently of Middle Eastern origin) called the “pentagram” or “Star of Solomon”. Let us note that the pentagram was often placed by the Bolsheviks on Red Army uniforms, military equipment, various signs and all kinds of attributes of visual propaganda in a purely satanic way: with two “horns” up. 3. Masonic signs Masons Motto:"Freedom. Equality. Brotherhood". A social movement of free people who, on the basis of free choice, make it possible to become better, to become closer to God, and therefore, they are recognized as improving the world. Signs The radiant eye (delta) is an ancient, religious sign. He says that God oversees his creations. With the image of this sign, Freemasons asked God for blessings for any grandiose actions or for their labors. The Radiant Eye is located on the pediment of the Kazan Cathedral in St. Petersburg. The combination of a compass and a square in a Masonic sign. For the uninitiated, this is a tool of labor (mason), and for the initiated, these are ways of understanding the world and the relationship between divine wisdom and human reason. For divine wisdom nothing is impossible, it can take on both a human form (-) and a divine form (0), it can contain everything. Thus, the human mind comprehends divine wisdom and embraces it. In philosophy, this statement is a postulate about absolute and relative truth. Hexagonal Star (Bethlehem) The letter G is the designation of God (German - Got), the great geometer of the Universe. Conclusion Mathematical symbols serve primarily to accurately record mathematical concepts and sentences. Their totality constitutes what is called mathematical language. As you know, mathematics loves precision and brevity - it’s not without reason that a single formula can, in verbal form, take up a paragraph, and sometimes even a whole page of text. Thus, graphical elements used throughout the world in science are designed to increase the speed of writing and the compactness of data presentation. In addition, standardized graphic images can be recognized by a native speaker of any language who has basic knowledge in the relevant field. The history of mathematical signs and symbols goes back many centuries - some of them were invented randomly and were intended to indicate other phenomena; others became the product of the activities of scientists who purposefully form an artificial language and are guided exclusively by practical considerations. The history of the origin of symbols denoting the simplest arithmetic operations is not known for certain. However, there is a fairly plausible hypothesis for the origin of the plus sign, which looks like crossed horizontal and vertical lines. In accordance with it, the addition symbol originates in the Latin union et, which is translated into Russian as “and”. Gradually, in order to speed up the writing process, the word was shortened to a vertically oriented cross, resembling the letter t. The earliest reliable example of such a contraction dates back to the 14th century. The generally accepted minus sign appeared, apparently, later. In the 14th and even 15th centuries, a number of symbols were used in scientific literature to denote the operation of subtraction, and only by the 16th century did “plus” and “minus” in their modern form begin to appear together in mathematical works. Oddly enough, the mathematical signs and symbols for these two arithmetic operations are not completely standardized today. A popular symbol for multiplication is the diagonal cross proposed by the mathematician Oughtred in the 17th century, which can be seen, for example, on calculators. In mathematics lessons at school, the same operation is usually represented as a point - this method was proposed by Leibniz in the same century. Another representation method is an asterisk, which is most often used in computer representation of various calculations. It was proposed to use it in the same 17th century by Johann Rahn. For the division operation, a slash sign (proposed by Oughtred) and a horizontal line with dots above and below are provided (the symbol was introduced by Johann Rahn). The first designation option is more popular, but the second is also quite common. Mathematical signs and symbols and their meanings sometimes change over time. However, all three methods of graphically representing multiplication, as well as both methods for division, are to one degree or another valid and relevant today. As with many other mathematical signs and symbols, the designation of equality was originally verbal. For quite a long time, the generally accepted designation was the abbreviation ae from the Latin aequalis (“equal”). However, in the 16th century, a Welsh mathematician named Robert Record proposed two horizontal lines located one below the other as a symbol. As the scientist argued, it is impossible to think of anything more equal to each other than two parallel segments. Despite the fact that a similar sign was used to indicate parallel lines, the new equality symbol gradually became widespread. By the way, such signs as “more” and “less”, depicting ticks turned in different directions, appeared only in the 17th-18th centuries. Today they seem intuitive to any schoolchild. Slightly more complex signs of equivalence (two wavy lines) and identity (three horizontal parallel lines) came into use only in the second half of the 19th century. The history of the emergence of mathematical signs and symbols also contains very interesting cases of rethinking graphics as science develops. The sign for the unknown, called today “X,” originates in the Middle East at the dawn of the last millennium. Back in the 10th century in the Arab world, famous at that historical period for its scientists, the concept of the unknown was denoted by a word literally translated as “something” and beginning with the sound “Ш”. In order to save materials and time, the word in treatises began to be shortened to the first letter. Many decades later, the written works of Arab scientists ended up in the cities of the Iberian Peninsula, in the territory of modern Spain. Scientific treatises began to be translated into the national language, but a difficulty arose - in Spanish there is no phoneme “Ш”. Borrowed Arabic words starting with it were written according to a special rule and were preceded by the letter X. The scientific language of that time was Latin, in which the corresponding sign is called “X”. Thus, the sign, which at first glance is just a randomly chosen symbol, has a deep history and was originally an abbreviation of the Arabic word for “something.” Unlike “X,” Y and Z, familiar to us from school, as well as a, b, c, have a much more prosaic origin story. In the 17th century, Descartes published a book called Geometry. In this book, the author proposed standardizing symbols in equations: in accordance with his idea, the last three letters of the Latin alphabet (starting from “X”) began to denote unknown values, and the first three - known values. The history of such a word as “sine” is truly unusual. The corresponding trigonometric functions were originally named in India. The word corresponding to the concept of sine literally meant “string”. During the heyday of Arabic science, Indian treatises were translated, and the concept, which had no analogue in the Arabic language, was transcribed. By coincidence, what came out in the letter resembled the real-life word “hollow”, the semantics of which had nothing to do with the original term. As a result, when Arabic texts were translated into Latin in the 12th century, the word "sine" emerged, meaning "hollow" and established as a new mathematical concept. But the mathematical signs and symbols for tangent and cotangent have not yet been standardized - in some countries they are usually written as tg, and in others - as tan. As can be seen from the examples described above, the emergence of mathematical signs and symbols largely occurred in the 16th-17th centuries. The same period saw the emergence of today's familiar forms of recording such concepts as percentage, square root, degree. Percentage, i.e. one hundredth, has long been designated as cto (short for Latin cento). It is believed that the sign that is generally accepted today appeared as a result of a typo about four hundred years ago. The resulting image was perceived as a successful way to shorten it and caught on. The root sign was originally a stylized letter R (short for the Latin word radix, “root”). The upper bar, under which the expression is written today, served as parentheses and was a separate symbol, separate from the root. Parentheses were invented later - they came into widespread use thanks to the work of Leibniz (1646-1716). Thanks to his work, the integral symbol was introduced into science, looking like an elongated letter S - short for the word “sum”. Finally, the sign for the operation of exponentiation was invented by Descartes and modified by Newton in the second half of the 17th century. Considering that the familiar graphic images of “plus” and “minus” were introduced into circulation only a few centuries ago, it does not seem surprising that mathematical signs and symbols denoting complex phenomena began to be used only in the century before last. Thus, the factorial, which looks like an exclamation mark after a number or variable, appeared only at the beginning of the 19th century. Around the same time, the capital “P” to denote work and the limit symbol appeared. It is somewhat strange that the signs for Pi and the algebraic sum appeared only in the 18th century - later than, for example, the integral symbol, although intuitively it seems that they are more commonly used. The graphical representation of the ratio of circumference to diameter comes from the first letter of the Greek words meaning "circumference" and "perimeter". And the “sigma” sign for an algebraic sum was proposed by Euler in the last quarter of the 18th century. As you know, the language of science in Europe for many centuries was Latin. Physical, medical and many other terms were often borrowed in the form of transcriptions, much less often - in the form of tracing paper. Thus, many mathematical signs and symbols in English are called almost the same as in Russian, French or German. The more complex the essence of a phenomenon, the higher the likelihood that it will have the same name in different languages. The simplest mathematical signs and symbols in Word are indicated by the usual key combination Shift+number from 0 to 9 in the Russian or English layout. Separate keys are reserved for some commonly used signs: plus, minus, equal, slash. If you want to use graphic images of an integral, an algebraic sum or product, Pi, etc., you need to open the “Insert” tab in Word and find one of two buttons: “Formula” or “Symbol”. In the first case, a constructor will open, allowing you to build an entire formula within one field, and in the second, a table of symbols will open, where you can find any mathematical symbols. Unlike chemistry and physics, where the number of symbols to remember can exceed a hundred units, mathematics operates with a relatively small number of symbols. We learn the simplest of them in early childhood, learning to add and subtract, and only at the university in certain specialties do we become familiar with a few complex mathematical signs and symbols. Pictures for children help in a matter of weeks to achieve instant recognition of the graphic image of the required operation; much more time may be needed to master the skill of performing these operations and understanding their essence. Thus, the process of memorizing signs occurs automatically and does not require much effort. The value of mathematical signs and symbols lies in the fact that they are easily understood by people who speak different languages and are native speakers of different cultures. For this reason, it is extremely useful to understand and be able to reproduce graphical representations of various phenomena and operations. The high level of standardization of these signs determines their use in a wide variety of fields: in the field of finance, information technology, engineering, etc. For anyone who wants to do business related to numbers and calculations, knowledge of mathematical signs and symbols and their meanings becomes a vital necessity . The course uses geometric language, composed of notations and symbols adopted in a mathematics course (in particular, in the new geometry course in high school). The whole variety of designations and symbols, as well as the connections between them, can be divided into two groups: group I - designations of geometric figures and relationships between them; group II designations of logical operations that form the syntactic basis of the geometric language. Below is a complete list of math symbols used in this course. Particular attention is paid to the symbols that are used to indicate the projections of geometric figures. Group I SYMBOLS INDICATING GEOMETRIC FIGURES AND RELATIONS BETWEEN THEM A. Designation of geometric figures 1. A geometric figure is designated - F. 2. Points are indicated by capital letters of the Latin alphabet or Arabic numerals: A, B, C, D, ... , L, M, N, ... 1,2,3,4,...,12,13,14,... 3. Lines arbitrarily located in relation to the projection planes are designated by lowercase letters of the Latin alphabet: a, b, c, d, ... , l, m, n, ... Level lines are designated: h - horizontal; f- front. The following notations are also used for straight lines: (AB) - a straight line passing through points A and B; [AB) - ray with beginning at point A; [AB] - a straight line segment bounded by points A and B. 4. Surfaces are designated by lowercase letters of the Greek alphabet: α, β, γ, δ,...,ζ,η,ν,... To emphasize the way a surface is defined, the geometric elements by which it is defined should be indicated, for example: α(a || b) - the plane α is determined by parallel lines a and b; β(d 1 d 2 gα) - the surface β is determined by the guides d 1 and d 2, the generator g and the plane of parallelism α. 5. Angles are indicated: ∠ABC - angle with vertex at point B, as well as ∠α°, ∠β°, ... , ∠φ°, ... 6. Angular: the value (degree measure) is indicated by the sign, which is placed above the angle: The magnitude of the angle ABC; The magnitude of the angle φ. A right angle is marked with a square with a dot inside 7. The distances between geometric figures are indicated by two vertical segments - ||. For example: |AB| - the distance between points A and B (length of segment AB); |Aa| - distance from point A to line a; |Aα| - distances from point A to surface α; |ab| - distance between lines a and b; |αβ| distance between surfaces α and β. 8. For projection planes, the following designations are accepted: π 1 and π 2, where π 1 is the horizontal projection plane; π 2 - frontal projection plane. When replacing projection planes or introducing new planes, the latter are designated π 3, π 4, etc. 9. The projection axes are designated: x, y, z, where x is the abscissa axis; y - ordinate axis; z - applicate axis. Monge's constant straight line diagram is denoted by k. 10. Projections of points, lines, surfaces, any geometric figure are indicated by the same letters (or numbers) as the original, with the addition of a superscript corresponding to the projection plane on which they were obtained: A", B", C", D", ... , L", M", N", horizontal projections of points; A", B", C", D", ... , L", M" , N", ... frontal projections of points; a" , b" , c" , d" , ... , l", m" , n" , - horizontal projections of lines; a" , b" , c" , d" , ... , l" , m " , n" , ... frontal projections of lines; α", β", γ", δ",...,ζ",η",ν",... horizontal projections of surfaces; α", β", γ", δ",...,ζ" ,η",ν",... frontal projections of surfaces. 11. Traces of planes (surfaces) are designated by the same letters as horizontal or frontal, with the addition of the subscript 0α, emphasizing that these lines lie in the projection plane and belong to the plane (surface) α. So: h 0α - horizontal trace of the plane (surface) α; f 0α - frontal trace of the plane (surface) α. 12. Traces of straight lines (lines) are indicated by capital letters, with which the words begin that define the name (in Latin transcription) of the projection plane that the line intersects, with a subscript indicating the affiliation with the line. For example: H a - horizontal trace of a straight line (line) a; F a - frontal trace of straight line (line) a. 13. The sequence of points, lines (any figure) is marked with subscripts 1,2,3,..., n: A 1, A 2, A 3,..., A n; a 1 , a 2 , a 3 ,...,a n ; α 1, α 2, α 3,...,α n; Ф 1, Ф 2, Ф 3,..., Ф n, etc. The auxiliary projection of a point, obtained as a result of transformation to obtain the actual value of a geometric figure, is denoted by the same letter with a subscript 0: A 0 , B 0 , C 0 , D 0 , ... Axonometric projections 14. Axonometric projections of points, lines, surfaces are denoted by the same letters as nature with the addition of a superscript 0: A 0, B 0, C 0, D 0, ... 1 0 , 2 0 , 3 0 , 4 0 , ... a 0 , b 0 , c 0 , d 0 , ... α 0 , β 0 , γ 0 , δ 0 , ... 15. Secondary projections are indicated by adding a superscript 1: A 1 0, B 1 0, C 1 0, D 1 0, ... 1 1 0 , 2 1 0 , 3 1 0 , 4 1 0 , ... a 1 0 , b 1 0 , c 1 0 , d 1 0 , ... α 1 0 , β 1 0 , γ 1 0 , δ 1 0 , ... To make it easier to read the drawings in the textbook, several colors are used when designing the illustrative material, each of which has a certain semantic meaning: black lines (dots) indicate the original data; green color is used for lines of auxiliary graphic constructions; red lines (dots) show the results of constructions or those geometric elements to which special attention should be paid. When people interact for a long time within a certain field of activity, they begin to look for a way to optimize the communication process. The system of mathematical signs and symbols is an artificial language that was developed to reduce the amount of graphically transmitted information while fully preserving the meaning of the message. Any language requires learning, and the language of mathematics in this regard is no exception. To understand the meaning of formulas, equations and graphs, you need to have certain information in advance, understand the terms, notation system, etc. In the absence of such knowledge, the text will be perceived as written in an unfamiliar foreign language. In accordance with the needs of society, graphic symbols for simpler mathematical operations (for example, notation for addition and subtraction) were developed earlier than for complex concepts like integral or differential. The more complex the concept, the more complex the sign it is usually denoted. In the early stages of the development of civilization, people connected the simplest mathematical operations with familiar concepts based on associations. For example, in Ancient Egypt, addition and subtraction were indicated by a pattern of walking feet: lines directed in the direction of reading they indicated “plus”, and in the opposite direction - “minus”. Numbers, perhaps in all cultures, were initially designated by the corresponding number of lines. Later, conventional notations began to be used for recording - this saved time, as well as space on physical media. Letters were often used as symbols: this strategy became widespread in Greek, Latin and many other languages of the world. The history of the emergence of mathematical symbols and signs knows two of the most productive ways of creating graphic elements. Initially, any mathematical concept is expressed by a certain word or phrase and does not have its own graphic representation (besides the lexical one). However, performing calculations and writing formulas in words is a lengthy procedure and takes up an unreasonably large amount of space on a physical medium. A common way to create mathematical symbols is to transform the lexical representation of a concept into a graphic element. In other words, the word denoting a concept is shortened or transformed in some other way over time. For example, the main hypothesis for the origin of the plus sign is its abbreviation from the Latin et, the analogue of which in Russian is the conjunction “and”. Gradually, the first letter in cursive writing stopped being written, and t reduced to a cross. Another example is the "x" sign for the unknown, which was originally an abbreviation of the Arabic word for "something". In a similar way, signs for denoting the square root, percentage, integral, logarithm, etc. appeared. In the table of mathematical symbols and signs you can find more than a dozen graphic elements that appeared in this way. The second common option for the formation of mathematical signs and symbols is to assign the symbol in an arbitrary manner. In this case, the word and graphic designation are not related to each other - the sign is usually approved as a result of the recommendation of one of the members of the scientific community. For example, the signs for multiplication, division, and equality were proposed by mathematicians William Oughtred, Johann Rahn and Robert Record. In some cases, several mathematical symbols may have been introduced into science by one scientist. In particular, Gottfried Wilhelm Leibniz proposed a number of symbols, including integral, differential, and derivative. Every schoolchild knows signs such as “plus” and “minus”, as well as symbols for multiplication and division, despite the fact that there are several possible graphic signs for the last two mentioned operations. It is safe to say that people knew how to add and subtract many millennia before our era, but standardized mathematical signs and symbols denoting these actions and known to us today appeared only by the 14th-15th centuries. However, despite the establishment of a certain agreement in the scientific community, multiplication in our time can be represented by three different signs (a diagonal cross, a dot, an asterisk), and division by two (a horizontal line with dots above and below or a slash). For many centuries, the scientific community exclusively used Latin to communicate information, and many mathematical terms and symbols find their origins in this language. In some cases, graphic elements were the result of shortening words, less often - their intentional or accidental transformation (for example, due to a typo). The percentage designation (“%”) most likely comes from a misspelling of the abbreviation who(cento, i.e. “hundredth part”). In a similar way, the plus sign came about, the history of which is described above. Much more was formed by deliberate shortening of the word, although this is not always obvious. Not every person recognizes the letter in the square root sign R, i.e. the first character in the word Radix (“root”). The integral symbol also represents the first letter of the word Summa, but intuitively it looks like a capital letter f without a horizontal line. By the way, in the first publication the publishers made just such a mistake by printing f instead of this symbol. Not only Latin ones are used as graphic notations for various concepts, but also in the table of mathematical symbols you can find a number of examples of such names. The number Pi, which is the ratio of the circumference of a circle to its diameter, comes from the first letter of the Greek word for circle. There are several other lesser-known irrational numbers, denoted by letters of the Greek alphabet. An extremely common sign in mathematics is “delta,” which reflects the amount of change in the value of variables. Another commonly used sign is “sigma”, which functions as a sum sign. Moreover, almost all Greek letters are used in mathematics in one way or another. However, these mathematical signs and symbols and their meaning are known only to people who are engaged in science professionally. A person does not need this knowledge in everyday life. Oddly enough, many intuitive symbols were invented quite recently. In particular, the horizontal arrow replacing the word “therefore” was proposed only in 1922. Quantifiers of existence and universality, i.e. signs read as: “there is ...” and “for any ...”, were introduced in 1897 and 1935 respectively. Symbols from the field of set theory were invented in 1888-1889. And the crossed out circle, which is known to any high school student today as the sign of an empty set, appeared in 1939. Thus, symbols for such complex concepts as integral or logarithm were invented centuries earlier than some intuitive symbols that are easily perceived and learned even without prior preparation. Due to the fact that a significant part of the concepts was described in scientific works in Latin, a number of names of mathematical signs and symbols in English and Russian are the same. For example: Plus, Integral, Delta function, Perpendicular, Parallel, Null. Some concepts in the two languages are called differently: for example, division is Division, multiplication is Multiplication. In rare cases, the English name for a mathematical sign becomes somewhat widespread in the Russian language: for example, the slash in recent years is often called “slash”. The easiest and most convenient way to familiarize yourself with the list of mathematical signs is to look at a special table that contains operation signs, symbols of mathematical logic, set theory, geometry, combinatorics, mathematical analysis, and linear algebra. This table presents the basic mathematical symbols in English. When performing various types of work, it is often necessary to use formulas that use characters that are not on the computer keyboard. Like graphic elements from almost any field of knowledge, mathematical signs and symbols in Word can be found in the “Insert” tab. In the 2003 or 2007 versions of the program, there is an “Insert Symbol” option: when you click on the button on the right side of the panel, the user will see a table that presents all the necessary mathematical symbols, Greek lowercase and uppercase letters, different types of brackets and much more. In program versions released after 2010, a more convenient option has been developed. When you click on the “Formula” button, you go to the formula constructor, which provides for the use of fractions, entering data under the root, changing the register (to indicate powers or serial numbers of variables). All the signs from the table presented above can also be found here. The mathematical notation system is an artificial language that only simplifies the writing process, but cannot bring an understanding of the subject to an outside observer. Thus, memorizing signs without studying terms, rules, and logical connections between concepts will not lead to mastery of this area of knowledge. The human brain easily learns signs, letters and abbreviations - mathematical symbols are remembered by themselves when studying the subject. Understanding the meaning of each specific action creates such strong signs that the signs denoting the terms, and often the formulas associated with them, remain in memory for many years and even decades. Since any language, including an artificial one, is open to changes and additions, the number of mathematical signs and symbols will certainly grow over time. It is possible that some elements will be replaced or adjusted, while others will be standardized in the only possible form, which is relevant, for example, for multiplication or division signs. The ability to use mathematical symbols at the level of a full school course is practically necessary in the modern world. In the context of the rapid development of information technology and science, widespread algorithmization and automation, mastery of the mathematical apparatus should be taken for granted, and the mastery of mathematical symbols as an integral part of it. Since calculations are used in the humanities, economics, natural sciences, and, of course, in the field of engineering and high technology, understanding mathematical concepts and knowledge of symbols will be useful for any specialist.
“... it is always possible to come up with a larger number, because the number of parts into which a segment can be divided has no limit; therefore, infinity is potential, never actual, and no matter what number of divisions is given, it is always potentially possible to divide this segment into an even larger number.” Note that Aristotle made a great contribution to the awareness of infinity, dividing it into potential and actual, and from this side came closely to the foundations of mathematical analysis, also pointing to five sources of ideas about it:
Further, infinity was developed in philosophy and theology along with the exact sciences. For example, in theology, the infinity of God does not so much give a quantitative definition as it means unlimited and incomprehensible. In philosophy, this is an attribute of space and time.
Modern physics comes close to the relevance of infinity denied by Aristotle - that is, accessibility in the real world, and not just in the abstract. For example, there is the concept of a singularity, closely related to black holes and the big bang theory: it is a point in spacetime at which mass in an infinitesimal volume is concentrated with infinite density. There is already solid indirect evidence for the existence of black holes, although the big bang theory is still under development.
The circle is a symbol of the Sun, Moon. One of the most common symbols. It is also a symbol of infinity, eternity, and perfection.
The poem is a rhombus.
Among the darkness.
The eye is resting.
The darkness of the night is alive.
The heart sighs greedily,
The whispers of the stars sometimes reach us.
And the azure feelings are crowded.
Everything was forgotten in the dewy brilliance.
Let's give you a fragrant kiss!
Shine quickly!
Whisper again
As then:
"Yes!"
Of course, you may not agree with these statements.
However, no one will deny that any image evokes associations in a person. But the problem is that some objects, plots or graphic elements evoke the same associations in all people (or rather, many), while others evoke completely different ones.
Properties of a triangle as a figure: strength, immutability.
Axiom A1 of stereometry says: “Through 3 points of space that do not lie on the same straight line, a plane passes, and only one!”
To test the depth of understanding of this statement, a task is usually asked: “There are three flies sitting on the table, at three ends of the table. At a certain moment, they fly apart in three mutually perpendicular directions at the same speed. When will they be on the same plane again?” The answer is the fact that three points always, at any moment, define a single plane. And it is precisely 3 points that define the triangle, so this figure in geometry is considered the most stable and durable.
The triangle is usually referred to as a sharp, “offensive” figure associated with the masculine principle. The equilateral triangle is a masculine and solar sign representing divinity, fire, life, heart, mountain and ascension, well-being, harmony and royalty. An inverted triangle is a feminine and lunar symbol, representing water, fertility, rain, and divine mercy.
State symbols of the United States also contain the Six-Pointed Star in different forms, in particular it is on the Great Seal of the United States and on banknotes. The Star of David is depicted on the coats of arms of the German cities of Cher and Gerbstedt, as well as the Ukrainian Ternopil and Konotop. Three six-pointed stars are depicted on the flag of Burundi and represent the national motto: “Unity. Job. Progress".
In Christianity, a six-pointed star is a symbol of Christ, namely the union of the divine and human nature in Christ. That is why this sign is inscribed in the Orthodox Cross.
Government”, which is under the complete control of Freemasonry.
Very often, Satanists draw a pentagram with both ends up so that it is easy to fit the devil’s head “Pentagram of Baphomet” there. The portrait of the “Fiery Revolutionary” is placed inside the “Pentagram of Baphomet”, which is the central part of the composition of the special Chekist order “Felix Dzerzhinsky” designed in 1932 (the project was later rejected by Stalin, who deeply hated “Iron Felix”).
The Marxist plans for a “world proletarian revolution” were clearly of Masonic origin; a number of the most prominent Marxists were members of Freemasonry. L. Trotsky was one of them, and it was he who proposed making the Masonic pentagram the identifying emblem of Bolshevism.
International Masonic lodges secretly provided the Bolsheviks with full support, especially financial.
Freemasons are comrades of the Creator, supporters of social progress, against inertia, inertia and ignorance. Outstanding representatives of Freemasonry are Nikolai Mikhailovich Karamzin, Alexander Vasilievich Suvorov, Mikhail Illarionovich Kutuzov, Alexander Sergeevich Pushkin, Joseph Goebbels.
The square, as a rule, from below is human knowledge of the world. From the point of view of Freemasonry, a person comes into the world to understand the divine plan. And for knowledge you need tools. The most effective science in understanding the world is mathematics.
The square is the oldest mathematical instrument, known since time immemorial. Graduation of the square is already a big step forward in the mathematical tools of cognition. A person understands the world with the help of sciences; mathematics is the first of them, but not the only one.
However, the square is wooden, and it holds what it can hold. It cannot be moved apart. If you try to expand it to accommodate more, you will break it.
So people who try to understand the entire infinity of the divine plan either die or go crazy. “Know your boundaries!” - this is what this sign tells the World. Even if you were Einstein, Newton, Sakharov - the greatest minds of mankind! - understand that you are limited by the time in which you were born; in understanding the world, language, brain capacity, a variety of human limitations, the life of your body. Therefore, yes, learn, but understand that you will never fully understand!
What about the compass? The compass is divine wisdom. You can use a compass to describe a circle, but if you spread its legs, it will be a straight line. And in symbolic systems, a circle and a straight line are two opposites. The straight line denotes a person, his beginning and end (like a dash between two dates - birth and death). The circle is a symbol of deity because it is a perfect figure. They oppose each other - divine and human figures. Man is not perfect. God is perfect in everything.
People always know the truth, but always relative truth. And absolute truth is known only to God.
Learn more and more, realizing that you will not be able to fully understand the truth - what depths we find in an ordinary compass with a square! Who would have thought!
This is the beauty and charm of Masonic symbolism, its enormous intellectual depth.
Since the Middle Ages, the compass, as a tool for drawing perfect circles, has become a symbol of geometry, cosmic order and planned actions. At this time, the God of Hosts was often depicted in the image of the creator and architect of the Universe with a compass in his hands (William Blake “The Great Architect”, 1794).
The Hexagonal Star meant Unity and the Struggle of Opposites, the struggle of Man and Woman, Good and Evil, Light and Darkness. One cannot exist without the other. The tension that arises between these opposites creates the world as we know it.
The upward triangle means “Man strives for God.” Triangle down - “Divinity descends to Man.” In their connection our world exists, which is the union of the Human and the Divine. The letter G here means that God lives in our world. He is truly present in everything he created.
The decisive force in the development of mathematical symbolism is not the “free will” of mathematicians, but the requirements of practice and mathematical research. It is real mathematical research that helps to find out which system of signs best reflects the structure of quantitative and qualitative relationships, which is why they can be an effective tool for their further use in symbols and emblems.Plus and minus
Multiplication and division
Equality, identity, equivalence
Sign of the unknown - “X”
Designation of other unknowns
Trigonometric terms
Some other signs
Later designations
Names of symbols in different languages
Computer notation of mathematical symbols
How to Remember Math Symbols
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B. Symbols denoting relationships between geometric figures
No. by por.
Designation
Content
Example of symbolic notation
1
≡
Match (AB)≡(CD) - a straight line passing through points A and B,
coincides with the line passing through points C and D2
≅
Congruent ∠ABC≅∠MNK - angle ABC is congruent to angle MNK
3
∼
Similar ΔАВС∼ΔMNK - triangles АВС and MNK are similar
4
||
Parallel α||β - plane α is parallel to plane β
5
⊥
Perpendicular a⊥b - straight lines a and b are perpendicular
6
Crossbreed c d - straight lines c and d intersect
7
Tangents t l - line t is tangent to line l.
βα - plane β tangent to surface α8
→
Displayed F 1 →F 2 - figure F 1 is mapped to figure F 2
9
S Projection Center.
If the projection center is an improper point,
then its position is indicated by an arrow,
indicating the direction of projection -
10
s Projection direction -
11
P Parallel projection р s α Parallel projection - parallel projection
onto the α plane in the s directionB. Set-theoretic notation
No. by por.
Designation
Content
Example of symbolic notation
Example of symbolic notation in geometry
1
M,N Sets -
-
2
A,B,C,... Elements of the set -
-
3
{ ... }
Comprises... Ф(A, B, C,...) Ф(A, B, C,...) - figure Ф consists of points A, B, C, ...
4
∅
Empty set L - ∅ - set L is empty (does not contain elements) -
5
∈
Belongs to, is an element 2∈N (where N is the set of natural numbers) -
the number 2 belongs to the set NA ∈ a - point A belongs to line a
(point A lies on line a)6
⊂
Includes, contains N⊂M - set N is part (subset) of set
M of all rational numbersa⊂α - straight line a belongs to the plane α (understood in the sense:
the set of points of the line a is a subset of the points of the plane α)7
∪
An association C = A U B - set C is a union of sets
A and B; (1, 2. 3, 4.5) = (1,2,3)∪(4.5)ABCD = ∪ [ВС] ∪ - broken line, ABCD is
combining segments [AB], [BC],8
∩
Intersection of many M=K∩L - the set M is the intersection of the sets K and L
(contains elements belonging to both the set K and the set L).
M ∩ N = ∅ - the intersection of the sets M and N is the empty set
(sets M and N do not have common elements)a = α ∩ β - straight line a is the intersection
planes α and β
a ∩ b = ∅ - straight lines a and b do not intersect
(do not have common points)Group II SYMBOLS INDICATING LOGICAL OPERATIONS
No. by por.
Designation
Content
Example of symbolic notation
1
∧
Conjunction of sentences; corresponds to the conjunction "and".
A sentence (p∧q) is true if and only if p and q are both trueα∩β = (К:K∈α∧K∈β) The intersection of surfaces α and β is a set of points (line),
consisting of all those and only those points K that belong to both the surface α and the surface β2
∨
Disjunction of sentences; matches the conjunction "or". Sentence (p∨q)
true when at least one of the sentences p or q is true (that is, either p or q, or both). -
3
⇒
Implication is a logical consequence. The sentence p⇒q means: “if p, then q” (a||c∧b||c)⇒a||b. If two lines are parallel to a third, then they are parallel to each other
4
⇔
The sentence (p⇔q) is understood in the sense: “if p, then also q; if q, then also p” А∈α⇔А∈l⊂α.
A point belongs to a plane if it belongs to some line belonging to this plane.
The converse statement is also true: if a point belongs to a certain line,
belonging to the plane, then it belongs to the plane itself5
∀
The general quantifier reads: for everyone, for everyone, for anyone.
The expression ∀(x)P(x) means: “for every x: the property P(x) holds”∀(ΔАВС)( = 180°) For any (for any) triangle, the sum of the values of its angles
at vertices equals 180°6
∃
The existential quantifier reads: exists.
The expression ∃(x)P(x) means: “there is an x that has the property P(x)”(∀α)(∃a).For any plane α there is a straight line a that does not belong to the plane α
and parallel to the plane α7
∃1
The quantifier of the uniqueness of existence, reads: there is only one
(-i, -th)... The expression ∃1(x)(Рх) means: “there is only one (only one) x,
having the property Px"(∀ A, B)(A≠B)(∃1a)(a∋A, B) For any two different points A and B, there is a unique straight line a,
passing through these points.8
(Px) Negation of the statement P(x) ab(∃α)(α⊃a, b).If lines a and b intersect, then there is no plane a that contains them
9
\
Negation of the sign ≠ -segment [AB] is not equal to segment .a?b - line a is not parallel to line b
Models for the formation of graphic symbols
Converting a Verbal Representation
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Simplest operations
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Is it worth learning math symbols?
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