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Mathematics
Umberto P.'s user avatar
Umberto P.'s user avatar
Umberto P.'s user avatar
Umberto P.
  • Member for 11 years, 3 months
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53
Does L'Hôpital's work the other way?
Nov 22, 2013
38
If a compact set is covered by a finite union of open balls of same radii, can we always get a lesser radius?
Jan 22, 2018
36
Trouble understanding only one way implication truth
Feb 5, 2018
28
Is $\int_{\sin x}^{\cos x}x\, dx$ not a well-defined integral?
Oct 26, 2018
28
Sum of reciprocal of primes
Aug 16, 2016
26
Unique weak solution to the biharmonic equation
Sep 19, 2014
22
Evaluate $\lim_{x\to 0} \frac{a^x -1}{x}$ without applying L'Hopital's Rule.
Apr 17, 2017
20
About absolute continuity $\Rightarrow$ null set maps to null set
Aug 19, 2016
18
If $x \in\mathbb{Z}$ has the property that for all $m \in\mathbb Z$, $mx = m$, then $x = 1$
Feb 6, 2015
18
Image of open set is not open?
Dec 19, 2014
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17 camels trick