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How to draw simple diagrams in discrete mathematics.
Discrete mathematics can draw a simple picture: starting from the number of edges and degrees, the number of edges can only be 0, 1, 2, 3, 4, 5, 6, and the degree of each vertex is between 0 and 3, so as to get the result.

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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.