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说明：  离散数学（Discrete mathematics）是研究离散量的结构及其相互关系的数学学科，是现代数学的一个重要分支。离散的含义是指不同的连接在一起的元素，主要是研究基于离散量的结构和相互间的关系，其对象一般是有限个或可数个元素。离散数学在各学科领域，特别在计算机科学与技术领域有着广泛的应用，同时离散数学也是计算机专业的专业课程(Discrete mathematics is a mathematical discipline which studies the structure of discrete variables and their relationship. It is an important branch of modern mathematics. The meaning of discrete refers to different elements connected together. It mainly studies the structure and relationship between discrete variables, and its objects are generally limited or countable elements. Discrete mathematics has a wide range of applications in various disciplines, especially in the field of computer science and technology.)