If sin x = sin y, then x = y + 2 m pi or x = (2 n + 1) pi - y

本帖于 2020-11-15 17:51:58 时间, 由普通用户 BeLe 编辑
回答: prove sin: N--R injective. 非常感谢。breehm2020-11-15 17:27:16

If sin x = sin y, then x = y + 2 m pi or x = (2 n + 1) pi - y, where m and n are integers.

Since x, y are integers and pi is an irrational number, we must have x = y, 

which proves injection.

 

 

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谢谢 -breehm- 给 breehm 发送悄悄话 breehm 的博客首页 (17 bytes) () 11/15/2020 postreply 18:40:47

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