User Hans Lundmark - English Language & Usage Stack Exchange

Hans Lundmark

Member for 8 years, 2 months
Last seen this week

users.mai.liu.se/hanlu09
Linköping, Sweden

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Mar 23, 2014

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363

Different methods to compute $\sum\limits_{k=1}^\infty \frac{1}{k^2}$ (Basel problem)

167

How do I get the square root of a complex number?

117

Derivative of sigmoid function $\sigma (x) = \frac{1}{1+e^{-x}}$

108

An Introduction to Tensors

85

How can we sum up $\sin$ and $\cos$ series when the angles are in arithmetic progression?