Antoine
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40 answers
202 votes
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Demonstrating that rigour is important
9 votes

Take the usual definition of Eisenstein functions $$G_k (\tau) = \sum\limits_{(c,d) \in \mathbb{Z}^2 - \{(0,0)\}} (c \tau + d)^{-k}$$ for integer $k \geq 2$. It is easy to prove that $$G_k \left( \...

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3 answers
7 votes
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Infinite dimensional simple algebras
0 votes

You can look at Kac-Moody algebras.

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