User Norbert - Academia Meta Stack Exchange

Norbert

Member for 7 years, 8 months
Last seen more than 6 years ago

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The one you probably have not heard of.

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Jan 13, 2019

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121

Continuous projections on $\ell_1$ with norm $>1$

120

Relations between p norms

63

Proving $\frac{\sin x}{x} =\left(1-\frac{x^2}{\pi^2}\right)\left(1-\frac{x^2}{2^2\pi^2}\right) \left(1-\frac{x^2}{3^2\pi^2}\right)\cdots$

45

How to show that quotient space $X/Y$ is complete when $X$ is Banach space, and $Y$ is a closed subspace of $X$?

34

Evaluating $ \lim\limits_{n\to\infty} \sum_{k=1}^{n^2} \frac{n}{n^2+k^2} $