Leonard Euler (1707-1783) - the famous Swissand a Russian mathematician, a member of the Petersburg Academy of Sciences, spent most of his life in Russia. The most famous in mathematical analysis, statistics, informatics and logic is the Euler circle (Euler-Venn diagram), used to denote the scope of concepts and sets of elements.

John Venn (1834-1923) is an English philosopher and logician, co-author of the Euler-Venn diagram.

The notion of logic is the formthinking, reflecting the essential features of a class of homogeneous objects. They are denoted by one or a group of words: "world map", "dominant quintuptakkord", "Monday", etc.

In the case when the elements of the volume of one conceptfully or partially belong to the volume of the other, speak of compatible concepts. If no element of the volume of a certain concept belongs to the volume of the other, we have a place with incompatible concepts.

In turn, each of the types of concepts has its own set of possible relationships. For compatible concepts this is the following:

- identity (equivalence) of volumes;
- intersection (partial coincidence) of volumes;
- subordination.

For incompatible:

- subordination (coordination);
- Contrast (contrast);
- contradiction.

Schematically, the relationship between concepts in logic is usually denoted by Euler-Venn circles.

In this case, the concepts mean the same thing. Accordingly, the volumes of these concepts completely coincide. For example:

A - Sigmund Freud;

B - the founder of psychoanalysis.

Or:

A is a square;

B is an equilateral rectangle;

C is a conformal rhombus.

For the designation, the completely coinciding Euler circles are used.

This category includes concepts that have common elements that are in relation to crossing. That is, the volume of one of the concepts is partly included in the scope of another:

A - the teacher;

B is a music lover.

As can be seen from this example, the scope of conceptspartly coincide: a certain group of teachers may turn out to be music lovers, and vice versa - representatives of the pedagogical profession may be among the music lovers. A similar relation will be in the case when, for example, the "citizen" appears as the concept A, and the "autoconductor" as B.

Schematically denoted as different in scalecircles of Euler. Relationships between concepts in this case are characterized by the fact that the subordinate concept (smaller in volume) is fully part of the subordinate (larger in volume). At the same time, the subordinate concept does not completely exhaust the subordinate.

For example:

A is a tree;

B - pine.

The concept of B will be subordinate to the concept of A. Since pine refers to trees, the concept A becomes in this example subordinate, "absorbing" the scope of the concept of B.

The relation characterizes two or more concepts that exclude each other, but belong to a certain common generic circle. For example:

A - clarinet;

B - guitar;

C - violin;

D is a musical instrument.

The concepts A, B, C are not intersecting with each other, nevertheless, they all belong to the category of musical instruments (concept D).

Opposite relations between conceptsimplies the attribution of these concepts to the same genus. In this case, one of the concepts has certain properties (attributes), while the other denies them, replacing the opposite in character. Thus, we are dealing with antonyms. For example:

A - the dwarf;

B - the giant.

The Euler circle, with the opposite relationship between concepts, is divided into three segments, the first of which corresponds to the concept of A, the second to the concept of B, and the third to all other possible concepts.

In this case, both concepts arespecies of the same genus. As in the previous example, one of the concepts indicates certain qualities (attributes), while the other denies them. However, unlike the relation of the opposite, the second, the opposite concept, does not replace the negated properties by others, alternative. For example:

A is a complicated problem;

B is a simple task (not-A).

Expressing the scope of concepts of this kind, the Euler circleis divided into two parts - the third, intermediate link in this case does not exist. Thus, concepts are also antonyms. In this case, one of them (A) becomes positive (affirming some attribute), and the second (B or not-A) - negative (denying the corresponding sign): "white paper" - "not white paper", "domestic history" - "foreign history", etc.

Thus, the ratio of the volumes of concepts in relation to each other is the key characteristic that determines the Euler circles.

It is also necessary to distinguish between the concepts of elements andsets whose volume represent the Euler circles. The notion of set is borrowed from mathematical science and has a rather wide meaning. Examples in logic and mathematics display it as a collection of objects. The objects themselves are elements of a given set. "Many are many, conceivable as one" (Georg Kantor, founder of set theory).

The notation of sets is made by capitalletters A, B, C, D ... etc., elements of sets - lower case: a, b, c, d ... etc. Examples of the set can be students who are in the same room, books on a certain shelf ( or, for example, all the books in a particular library), pages in the diary, berries in a forest glade, etc.

In turn, if a certain set is notcontains no elements, it is called empty and is denoted by the sign of Ø. For example, the set of points of intersection of parallel lines, the set of solutions of the equation x^{2} = -5.

To solve a large number of tasks activelyEuler circles are used. Examples in logic clearly demonstrate the relationship of logical operations to set theory. In this case, truth tables of concepts are used. For example, the circle denoted by the name A is a truth area. Thus, the region outside the circle will be a lie. To determine the area of the diagram for a logical operation, it is necessary to shade the areas defining the Euler circle in which its values for elements A and B are true.

The use of Euler circles found widepractical application in different industries. For example, in a situation with a professional choice. If the subject is preoccupied with choosing a future profession, he can be guided by the following criteria:

W - what do I like to do?

D - what do I get?

P - how can I make good money?

We depict this in the form of a diagram: Euler circles (examples in logic are the ratio of the intersection):

The result will be those professions that will be at the intersection of all three circles.

A separate place Euler-Venn circles occupymathematics (set theory) in the calculation of combinations and properties. Euler circles of the set of elements are enclosed in the image of the rectangle denoting the universal set (U). Instead of circles, other closed figures can also be used, but the essence of this does not change. The figures intersect each other, according to the conditions of the problem (in the most general case). Also, these figures should be marked accordingly. As the elements of the sets under consideration, points located inside different segments of the diagram can act. On its basis, it is possible to shade specific areas, thus denoting newly formed sets.

With these sets, execution is possiblebasic mathematical operations: addition (the sum of sets of elements), subtraction (difference), multiplication (product). In addition, thanks to the Euler-Venn diagrams, it is possible to perform operations of comparing sets by the number of elements included in them, not counting them.

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