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Aug
25
awarded  Yearling
Aug
23
comment $y=\tan^{-1}\frac{1}{x^2+x+1}+\tan^{-1}\frac{1}{x^2+3x+3}+\tan^{-1}\frac{1}{x^2+5x+7}+\tan^{-1}\frac{1}{x^2+7x+13}…$to n terms.
Please clarify the formula for the $n$th term.
Aug
23
revised Non trivial non prime or maximal ideals
fix double digit subscript
Aug
17
answered Stable marriage problem with all men having the same preference
Aug
12
answered Splitting an ideal lying in a prime ideal
Aug
12
answered Two questions about Schubert calculus and Schur functions.
Aug
12
answered What is a permutation representation in regard to group actions
Aug
4
comment Is there any neat way to show $\phi$ is a homomorphism?
@ElliotG But then you do not get a homomorphism on all of $S_4$... only those elements in the subgroup that fixes 4.
Aug
4
answered For a root system, why does $\beta\in\Delta_+\setminus\{\alpha_i\}$ imply $(\beta+\mathbb{Z}\alpha_i)\cap\Delta\subset\Delta_+$?
Aug
4
comment Rearrangements that never change the value of a sum
@Gary The question is asking for a condition on the permutations that work for all sequences, not the other way around.
Aug
3
awarded  Good Answer
Aug
1
revised Sprague–Grundy numbers
edited tags
Jul
31
answered Elements of $S_n$ which can not be product of $\leq n-2$ transpositions
Jul
29
revised Inserting parentheses to produce different values
remove inappropriate tag algebraic-geometry and replace with notation
Jul
28
comment Why Composition and Dihedral Group have reverse order of operation?
Alias vs alibi: isites.harvard.edu/fs/docs/icb.topic446952.files/aliasalibi.pdf
Jul
28
comment Why Composition and Dihedral Group have reverse order of operation?
Or, possibly you are assuming that the numbers move with the hexagon when you rotate it, so that $s$ isn't always "reflection across the horizontal" but instead "reflection across the 1-4 axis, wherever it may currently be." I am assuming that the numbers stay put when the hexagon moves. In general, these 2 conventions (labels move vs labels stay) cause a right-to-left vs left-to-right reversal (see "alias vs alibi transformations".)
Jul
28
comment Why Composition and Dihedral Group have reverse order of operation?
You wrote that (15) corresponds to $r^2s$. This is only correct if $r^2s$ means "first $s$, then $r^2$".
Jul
28
answered Why Composition and Dihedral Group have reverse order of operation?
Jul
28
comment Why Composition and Dihedral Group have reverse order of operation?
It will be easier to follow your post if you include the "original" labeling of the hexagon.
Jul
19
answered Is this a contradiction in probability?