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[函数] 一个连乘三角恒等式的疑问

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lemondian posted 2022-6-9 21:39 |Read mode
如图(证明过程主要参考forum.php?mod=viewthread&tid=3996#pid17381  的11#,12#)
60902.jpg

有位群友认为这个证明有两个问题:
1.$k$的范围有问题:(上图的标红处)
然后我改为
60903.jpg

2.证明过程有些不严谨:
但我看不出哪个地方不严谨

请问各位,这个证明有什么地方需要完善的吗?
@kuing

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original poster lemondian posted 2022-6-10 08:56
Help!!!

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tommywong posted 2022-6-10 14:01 from mobile
唔知

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