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Mathematics
Hans Lundmark's user avatar
Hans Lundmark's user avatar
Hans Lundmark's user avatar
Hans Lundmark
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answer
390
Different ways to prove $\sum_{k=1}^\infty \frac{1}{k^2}=\frac{\pi^2}{6}$ (the Basel problem)
Oct 30, 2010
answer
188
How do I get the square root of a complex number?
Jun 10, 2011
answer
125
Derivative of sigmoid function $\sigma (x) = \frac{1}{1+e^{-x}}$
Nov 3, 2011
answer
119
An Introduction to Tensors
Nov 15, 2010
answer
92
How can we sum up $\sin$ and $\cos$ series when the angles are in arithmetic progression?
Jan 18, 2011
answer
80
Funny identities
Nov 4, 2010
answer
72
What does E mean in 9.0122222900391E-5?
Oct 7, 2010
answer
69
Different ways to prove $\sum_{k=1}^\infty \frac{1}{k^2}=\frac{\pi^2}{6}$ (the Basel problem)
Nov 1, 2010
answer
61
lim sup and lim inf of sequence of sets.
Sep 2, 2016
answer
56
Why do different calculators disagree on $\cos(452175521116192774 )$?
May 28, 2022
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Disable "share a link" popup?
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Using Taylor expansion on a limit tagged "without L'Hospital"
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"New comments posted" notification when writing answers?
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List of Generalisations of Common Questions
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Bold math: Automatic choice between \mathbf and \boldsymbol for Latin and Greek symbols?
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Strengthening the induction hypothesis
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Are there other nice math books close to the style of Tristan Needham?
11
"Wild" solutions of the heat equation: how to graph them?
11
LaTeX template for resume/curriculum vitae