Can the following statement be proved? "there are only two different groups of order 4 up to isomorphism" I have seen somewhere that there are only two groups up to isomorphism of order 4 -cyclic of order 4 and the klein4 group.All other groups with 4 elements are isomorphic to one of these.Really I don't have any idea on attempting this problem, so I please need your help.Thanks all!
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