My history of maths lecturer claims Pythagoras never existed. Is this true? Is there any evidence he existed? He also claims the Pythagoreans did not discover or prove the Pythagorean theorem.

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    $\begingroup$ You should post question about the history of science and mathematics on our main site: History of Science and Mathematics. The meta-HSM site that you're currently posting on is exclusively reserved for discussions about the site (so-called meta-discussions). I'll move these questions to the main site for you, but please ask them there directly in the future. $\endgroup$ – Danu Oct 31 '15 at 8:23