摘要：Definition: Graph An (undirected simple) graph is a pair \(G = (V,E)\), where \(V\) stands for the sets of vertices, and \(E\) stands for the edges se 阅读全文

摘要：无穷集合 集合的比较 ： \(=\) ，\(\le\) \(\quad\quad\) 工具：\(function\) Definition: 集合等势 \(\vert A \vert = \vert B \vert \Leftrightarrow \exists f:A \to B( f \text 阅读全文