Now a few weeks ago I saw on the Internet a proof of the equation $x^2 + y^2=z^2$. Now I search the link but I didn't find it. Can you help me? Maybe you know.Thank you!
Solve the equation $x^2 + y^2=z^2$ using group cohomology.
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$\begingroup$
homology-cohomology
group-cohomology
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0Do you mean in integers? It's very unclear what you are asking. – 2017-01-12
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2Perhaps you are looking for this sort of proof? http://mathoverflow.net/questions/10879/intuition-for-group-cohomology/10903#10903 – 2017-01-12
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0This is the link! Thank you! – 2017-01-12