W. Schlieper
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 Feb 15 revised Fermat Quartic Tiling added 9 characters in body Feb 15 answered Fermat Quartic Tiling Jan 12 comment Probability Problem: Find the probability Roy loses his job Consider, e.g. L L L W L. Oct 13 awarded Commentator Oct 13 comment How many ways are there of rolling 6 different coloured 6-sided dice so that exactly 3 different values are showing? The color would just be to ensure that, say, red six and blue three is a different situation than blue six and red three. Oct 13 awarded Editor Oct 13 revised Why functions can't be integrated on manifolds explicit definition of pullback Oct 13 awarded Yearling Oct 13 comment Getting scaling from a 2D Matrix Uh, what is the scaling? Do you mean the eigenvalues? That won't calculate the eigenvalues correctly. Oct 13 answered Why functions can't be integrated on manifolds Oct 13 answered How can I express pre- and post-multiplication as a single linear operator? Oct 13 comment Number Theory: $x^2\equiv 1\pmod{140}$ Chinese remainder theorem only lets you factor into prime power factors, not necessarily prime factors themselves. Oct 4 awarded Critic Sep 29 comment Geometric way to view the truncated braid groups? For n=3 there's definitely a link to the Platonic solids; I can probably give an answer tying it together on a representation-theoretic level. For n>3 you might be able to find a link but it's probably going to require you do something like cut out a particular slice; consider k=2, where the resulting group is the good old symmetric group, and the dihedral symmetry that comes from the corresponding "solid" is much smaller than the full symmetric group. Sep 24 awarded Autobiographer Sep 6 answered If $A^3=I$ for a real matrix, is $A$ normal/orthogonal? Dec 15 comment How to integrate That seems like it would be difficult with a square domain though. Jul 24 awarded Supporter Jul 5 answered Logarithm rules Jun 19 comment Fractional part of $b \log a$ The difference between consecutive convergents of a continued fraction is always one divided by the product of their denominators.