The main checks of transitivity are as follows: As long as aRb and bRc are established at the same time, then aRc must also be established.

Mathematically, binary relation is used to discuss the connection between two mathematical objects. Such as "greater than" and "equal to" in arithmetic and "similar" in geometry. Binary relationships are sometimes called relationships, but generally speaking, relationships are not necessarily binary.

The relative difference set of sets u and a, with the symbol u? A is all the elements in the set U but not in the set A. Relative difference set {1, 2,3}? {2,3,4} is {1}, and the relative difference set is {2,3,4}? {1, 2,3} is {4}.

Extended data;

Discrete mathematics can be regarded as a bridge between mathematics and computer science, because discrete mathematics is not only inseparable from mathematical knowledge such as set theory and graph theory, but also related to database theory and data structure in computer science. It can lead people into the thinking field of computer science and promote the development of computer science.

Discrete mathematics is divided into three courses, namely set theory and graph theory, algebraic structure and combinatorial mathematics, and mathematical logic. The teaching method is mainly classroom teaching, supplemented by written homework after class, courseware release through the school network teaching platform and teacher-student communication.

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