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Harald Hanche-Olsen's user avatar
Harald Hanche-Olsen's user avatar
Harald Hanche-Olsen's user avatar
Harald Hanche-Olsen
  • Member for 12 years, 6 months
  • Last seen more than a week ago
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Main interests: Partial differential equations, especially hyperbolic systems of conservation laws. See my home page if you want to know more.

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158
How do I convince my students that the choice of variable of integration is irrelevant?
Jan 21, 2014
66
If $e^A$ and $e^B$ commute, do $A$ and $B$ commute for finite dimensional matrices?
Apr 2, 2013
52
Self-Contained Proof that $\sum\limits_{n=1}^{\infty} \frac1{n^p}$ Converges for $p > 1$
Apr 11, 2012
45
Of any 52 integers, two can be found whose difference of squares is divisible by 100
Dec 12, 2013
42
Matrix raised to 14th power
Dec 1, 2013
35
Can there be a function that's even and odd at the same time?
Jun 17, 2012
34
Why Do The Axioms of Euclidean Geometry Not Need To Include the Definition of Space?
Jan 23, 2015
29
An example for a calculation where imaginary numbers are used but don't occur in the question or the solution.
Oct 31, 2012
28
How many times are the hands of a clock at $90$ degrees.
Dec 14, 2013
25
I need a proof that a line cannot intersect a circle at three distinct points
Mar 1, 2012
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Probabilistic proofs of analytic facts
78
Wrong (hyper-)references after resetting chapter counter
75
Why is an elliptic curve a group?
63
How to monitor file access for an OS X application?
61
What's a good way to write "x does not divide y"?