# Did

As somebody used to say:

Does research. Smokes. Battles administration. Smokes. Wishes he could stop battling administration so that he could have more time to do research. Smokes some more.

The same. Except I do not smoke.

This paragraph is for my personal use but freely available:

Welcome to Math.SE! Please, consider updating your question to include what you have tried and where you are getting stuck. That way, people on this site will know exactly what help you need.

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## Proving $\sum\limits_{l=1}^n \sum\limits _{k=1}^{n-1}\tan \frac {lk\pi }{2n+1}\tan \frac {l(k+1)\pi }{2n+1}=0$

Jul 22 '12 at 12:42

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Oct 23 at 17:28

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## Limit of sum with binomial coefficient

Jun 26 '12 at 22:44

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## On answers that are nothing but the image of a textbook

Mar 21 '11 at 22:14

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## Math journal for high school students?

Aug 5 '10 at 0:36

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## Correlated Brownian motion and Poisson process

Sep 21 '12 at 14:56

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## Idempotence and the Raoâ€“Blackwell theorem

Apr 13 '12 at 1:58

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## Conditional expectation of the product of two independent random variables

Oct 30 '12 at 11:32

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