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Per Manne
Bergen, Norway
Age: 49
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Top Questions
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Top Answers
45
Unusual 5th grade problem, how to solve it
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35
Why does $\tan^{-1}(1)+\tan^{-1}(2)+\tan^{-1}(3)=\pi$?
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28
What do we lose passing from the reals to the complex numbers?
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20
The graph of xy = 1 is connected or not
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19
Father and daughter river crossing puzzle.
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18
Prove that $A=\left(\begin{array}{ccc}1&2&3\\4&5&6\\7&8&9\end{array}\right)$ is not invertible
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9
A couple of formulas for $\pi$
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8
Did Leonardo of Pisa prove $n=4$ case of FLT?
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7
Geometric proof that $\left|\frac{i-z}{i+z}\right|<1$ for $z\in \mathbb{H}$
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7
Is this limit equal to 1?
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6
What is the integral of 1/x?
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6
Tricks to Intuitively See Uniform Continuity
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6
How many chess games of a suspect does one have to analyze to have a reliable answer to the question whether the suspect cheats?
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6
What is the probability of this exact same Champions League draw?
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5
A function which is in $L^1$ but does not belong to $L^\infty$
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5
Needing an example of one riemann integrable function
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