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Norbert
  • Member for 12 years, 2 months
  • Last seen this week
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The one you probably have not heard of.

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Valid but unspecified state. What is specified then?
Dec 4, 2025

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148
Relations between p norms
124
Continuous projections on $\ell_1$ with norm $>1$
74
Proving $\frac{\sin x}{x} =\left(1-\frac{x^2}{\pi^2}\right)\left(1-\frac{x^2}{2^2\pi^2}\right) \left(1-\frac{x^2}{3^2\pi^2}\right)\cdots$
60
How to show that quotient space $X/Y$ is complete when $X$ is Banach space, and $Y$ is a closed subspace of $X$?
37
Evaluating $ \lim\limits_{n\to\infty} \sum_{k=1}^{n^2} \frac{n}{n^2+k^2} $