T(R) drawing method of discrete mathematics: two graphs are isomorphic, but they are actually one graph, but the labels are different or the drawing methods are different. It is drawn according to the definitions of r(R), s(R) and t(R). For example, r(R) is a reflexive closure, which must be supplemented by aRa, and so on.

Write the relation r = {

Discrete mathematics

It is a comprehensive subject that integrates traditional logic, set theory (including functions), number theory foundation, algorithm design, combinatorial analysis, discrete probability, relational theory, graph theory and tree, and abstract algebra (including algebraic system, group, ring, field, etc.). ), Boolean algebra, computational models (languages and automata) and so on. The application of discrete mathematics covers many fields of modern science and technology.