The explanation of mathematical logic is also called symbolic logic. In a narrow sense, it refers to the study of deductive thinking and mathematical basis in mathematics by mathematical methods. In a broad sense, it refers to the use of symbols and mathematical methods to deal with and study all the knowledge of deduction. It is both a branch of mathematics and a branch of logic. Mathematical logic is of great significance to mathematical research and engineering technology, and it is also effective in solving some problems in general thinking. The explanatory number (number) of word decomposition number is a quantity expressed, divided or calculated: number. Quantity. Numbers. Number theory (a branch of mathematics that mainly studies the properties of positive integers and the laws related to them). Numerical control. A few, a few: several people. A few days. Skills, academic: "The number of games played today is decimal." Destiny and the logic of heaven is a science that studies the norms and standards of thinking and argumentation effectiveness. Traditionally, it includes the principles of definition, classification and correct use of words, correct cloud prediction and reasoning. The law of thinking is illogical, objective and regular. Detailed logical explanation of thinking law. Sha Ting