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The rise and development of computers are changing the face of the world rationally and meaningfully. Many new problems faced by contemporary mathematicians are related to "discrete mathematics", one of the important basic theories of computers. Discrete mathematics tries to explain natural phenomena with a single element, such as sand on the beach or numbers 1, 2, 3, etc. In order to facilitate the processing of a single countable thing by the computer. Calculus, which used to deal with continuous variables, has a sacred position in universities, so now it can be said that it is not worthy of the name, and discrete mathematics challenges it. Discrete mathematics has some advantages that calculus can't do: it can turn many problems about discrete quantities into mechanical operations; With simple narration and many ingenious proof skills, we can introduce a series of quite profound reasoning and draw some valuable conclusions.
Discrete mathematics is extremely rich, including many branches of mathematics, such as set and correspondence, elementary number theory, modern algebra, mathematical logic, graph theory, combinatorial mathematics, recursive function and so on. Many important problems stem from solving math games and seemingly simple and interesting math problems. Because of its entertainment and aesthetic charm, it has been studied by many mathematics lovers. Now Zhan plays an important role in both pure mathematics and applied mathematics.