科学术语及其相关符号，总是紧扣概念范畴的本质．自然科学更讲究逻辑推理、更讲究其内涵、外延的准确与缤密，因此这种特点也更为显著．当有关术语、符号、表达方式不那么理想的时候，学术界会自动地修正它．比如函数的概念，就曾历经“沧桑”；整数集合由J改为Z，阶乘由n变为 Scientific terms and their related symbols are always closely related to the nature of the concept category. Natural science is more about logical reasoning, more about its connotation, and more accurate and colorful extensions, so this feature is even more pronounced. When academic terms, symbols, and expressions are less than ideal, the academic community will automatically correct it. For example, the concept of a function has experienced “vicissitudes”; the integer set has changed from J to Z, and the factorial has been changed from n to