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Why do mathematicians keep proving things they already know?

What exactly is a mathematical proof? Columnist Jacob Aron breaks down how mathematicians plot a course to answer open questions, and how finding several solutions to the same problem is an important part of the whole endeavour of maths

Why do mathematicians keep proving things they already know?

We haven't written up this one. New Scientist has the full story — the link below goes straight to it.

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