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Aug
23
comment Parameterizing rotations of a cube
Hmm. Having to check 24 things in an innermost loop could be painful. (You'll have to do timings to check. Perhaps using the unit quaternions, instead of SO(3), will speed things up.) Nonetheless, a simple implementation that works slowly is better than a clever idea that doesn't work at all. :)
Aug
23
revised Parameterizing rotations of a cube
removed some of the condescension ;)
Aug
23
revised Parameterizing rotations of a cube
discussion of the metric.
Aug
23
answered Parameterizing rotations of a cube
Aug
19
comment Immersed quasi-Fuchsian surfaces surviving Dehn fillings
Just to make things super clear, I edited your post to use the phrase "immersed boundary slope" (as opposed to "embedded boundary slope", etc). This follows Maher's usage.
Aug
19
revised Immersed quasi-Fuchsian surfaces surviving Dehn fillings
added discussion of other two questions.
Aug
19
revised Immersed quasi-Fuchsian surfaces surviving Dehn fillings
typo
Aug
19
revised Immersed quasi-Fuchsian surfaces surviving Dehn fillings
immersed slope -> immersed boundary slope
Aug
19
answered Immersed quasi-Fuchsian surfaces surviving Dehn fillings
Aug
19
comment Immersed quasi-Fuchsian surfaces surviving Dehn fillings
Just as a matter of terminology - almost everybody uses "boundary slope" to refer to the slopes that occur as the boundaries of embedded essential surfaces. So you should rewrite your question to talk about, say, "immersed slopes" or some similar construction.
Aug
19
comment Immersed quasi-Fuchsian surfaces surviving Dehn fillings
You have to add some condition on $\gamma$. After all, it could be that $M(\gamma)$ is the three-sphere -- in that case the fundamental group is trivial, so in particular it has no non-trivial free subgroups.
Aug
5
reviewed Edit Do convolution and multiplication satisfy any nontrivial algebraic identities?
Aug
5
revised Do convolution and multiplication satisfy any nontrivial algebraic identities?
It is shown that the suggested formula at least doesn't apply generally, with a very simple example.
Jul
31
comment Computation Time of Smith Normal Form in Maple
For any large (and important) computation, you should consider checking multiple CAS's against each other. Eg Mathematica and Sage in addition to Maple.
Jul
25
comment Your favorite papers on geometric group theory
Note that the poster is not asking for the "best" papers, but rather for suggestions of "favorite" papers. I'm very interested in hearing what the experts have to say!
Jul
21
comment Is the family of probabilities generated by a random walk on a finitely generated amenable group asymptotically invariant?
Can you edit the post? The button "edit" should be visible just below the tags.
Jul
20
comment Products of elliptic isometries
Dear Seirios - Could I ask you to spell out the intended definition of ${\rm Fix}_\delta$?
Jul
20
comment Products of elliptic isometries
Ah - very good. That makes much more sense. Well, if this is the definition meant then that should be included in the original question???
Jul
19
comment Products of elliptic isometries
Also, if $g = h$ then your equality is satisfied, as both sides are zero...
Jul
19
comment Products of elliptic isometries
Dear Anton - Your condition does not work, because it is not symmetric in $g$ and $h$. For example, consider the $(2,p,\infty)$ triangle group. Let $g$ be the element of order $p$ and let $h$ be the element of order $2$. The point is that the "broken geodesic" needs to be more-or-less straight at all of its corners (not just at half of them).