Often people allude to examples of hard problems or theorems of which trivial solutions (or proofs) were found by applying techniques from abstract algebra. Can you give an example of such a problem or a theorem?
Concrete examples of abstract algebra delivering simple solutions to hard problems
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big-list
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0Solving "rubic's cube"? – 2012-11-04
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0It seems to me that there ought to be a lot more answers to this question. – 2016-04-03