In mathematics and logic, we usually use other symbols to express different logical relationships. For example, "If ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………… "If and only if" can be used "?" Symbolic representation, such as p? Q stands for "p if and only if q"; "or" can be represented by "∨" symbol, such as p∨q means "p or q"; "and" can be represented by the symbol "∧", for example, p∧q means "p and q".
Discrete mathematics is a branch of mathematics, which mainly studies discrete structures and their properties, including sets, functions, relations, graph theory and so on. In discrete mathematics, we also use various symbols to express mathematical concepts and logical relationships.