how to prove a group is a finite group

muzhiqingfeng

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Joined
Dec 25, 2009
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some math problems can be done via using the method "reduction to absurdity",but I don't like it when a problem can only be solved by that.
And I'd like to know more about some problems that can only be solved by using that method.
What's your opinion about the "reduction to absurdity"?
:D question:The number of elements whose order is greater than 2 is even in a finite group.
 
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