写数学或物理证明的时候，都有哪些情况会用到恒等号？
2012-01-19 20:31:07   来源：   点击：

3 个答案

• 答案 1：

  ≡ means modular congurent in number theory, equivalent in logic. In your case, it should have the meaning of identity : Take two functions f and g as an exemple. f=g or f(x)=g(x), rigorously speaking, are not legal expressions, because they give no condition on the variable x for the equality to be valid. If the condition is actually "any x", you should write "f(x)=g(x) for all x", or f(x)≡g(x). en.wikipedia.org/wiki...

• 答案 2：

  参数变化而等号始终成立才可用恒等号

• 答案 3：

  當需要強調“等於”這個條件或結論時就會使用到的，這算是數學中的一個強調句吧。