Per Manne

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location Bergen, Norway
age 49
visits member for 11 months
seen May 21 at 20:14
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109 Answers

newest activity votes
46
Unusual 5th grade problem, how to solve it
35
Why does $\tan^{-1}(1)+\tan^{-1}(2)+\tan^{-1}(3)=\pi$?
28
What do we lose passing from the reals to the complex numbers?
20
The graph of xy = 1 is connected or not
19
Father and daughter river crossing puzzle.
18
Prove that $A=\left(\begin{array}{ccc}1&2&3\\4&5&6\\7&8&9\end{array}\right)$ is not invertible
9
A couple of formulas for $\pi$
8
Did Leonardo of Pisa prove $n=4$ case of FLT?
7
Is this limit equal to 1?
7
Geometric proof that $\left|\frac{i-z}{i+z}\right|<1$ for $z\in \mathbb{H}$
6
What is the probability of this exact same Champions League draw?
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?
6
Tricks to Intuitively See Uniform Continuity
6
What is the integral of 1/x?
5
Needing an example of one riemann integrable function
5
A function which is in $L^1$ but does not belong to $L^\infty$
4
Evaluate $\lim_{n\to\infty}n\sin(2\pi \mathrm en!)$
4
closure, convex hull and closed convex hull
4
divisibility for numbers like 13,17 and 19 - Compartmentalization method
4
Undergraduate approach to a problem about convex functions
4
Remembering exact sine cosine and tangent values?
4
Which simple puzzles have fooled professional mathematicians?
4
History of Dual Spaces and Linear Functionals
3
Plato's Disc of Gold
3
Finding summation
3
Doing arithmetic in one step
3
Convergence/absolute convergence of $\int_0^\infty \frac{\cos x}{1+x}dx$ (Baby Rudin P6.9)
3
Working on this summation proof
3
history of the double root solution of $ay''+by'+cy=0$
3
How is the hint supposed to be used in this Exponential distribution stimulating exercise?
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