I know it's not right to have favorites, and just because someone is my favorite mathematician doesn't mean they're the best, or that there's a mathematician better than the others, and all that. But I have to confess that I have a favorite mathematician, and that's LEONHARD EULER, and I'll tell you why.
Euler Archive:
http://eulerarchive.maa.org/
My article on the Euler characteristic with Bjarke H. Roune:
https://arxiv.org/pdf/1112.4523.pdf
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