| Title: | Démonstration élémentaire de la formule $\frac{\pi^2}{\sin^2 x\pi} = \sum_{\nu= -\infty}{\infty}\frac{1}{(x+\nu)^2}$ (French) | 
| Title: | Elementary proof of the formula $\frac{\pi^2}{\sin^2 x\pi} = \sum_{\nu= -\infty}{\infty}\frac{1}{(x+\nu)^2}$ (English) | 
| Author: | Lerch, Matyáš | 
| Language: | French | 
| Info: | Enseign. Math. 5(1903), 450--453 | 
| Pages: | 450-453 | 
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| Category: | math | 
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| idZBL: | JFM 34.0311.04 | 
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| Date available: | 2019-08-08T07:07:03Z | 
| Last updated: | 2019-09-20 | 
| Stable URL: | http://hdl.handle.net/10338.dmlcz/501549 | 
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