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Apr
16
revised Is there a formula for the number of elements in $S_n$ having length $k$ with respect to the generators taken to be the transpositions?
added the word "adjacent"
Apr
3
answered Counting faces on multipermutahedra/multipermutohedra
Apr
2
comment Examples of math hoaxes/interesting jokes published on April Fool's day?
At that time I was an Assistant Professor. My mother read the Gardner column in Scientific American and sent me a letter asking whether I knew that the Four Color Conjecture had been disproved.
Mar
30
awarded  Great Answer
Mar
5
comment Why is the Frankl conjecture hard?
Perhaps the conjecture is false, but the counterexamples are large with very little structure.
Mar
4
asked Counting nonzero hyperdeterminants over $\mathbb{F}_q$
Mar
2
comment Is the number of representations as the sum of two elements of a polynomial sequence always small?
A related question is mathoverflow.net/questions/45511.
Feb
28
comment How do Schubert classes form a basis for $H^{*}(Gr(k, n))$?
Some references are given beginning on page 1078 of Kleiman and Laksov's survey math.ucr.edu/~jdolan/schubert1.pdf.
Feb
26
revised Independence between the number of prime factors of $n$ and $n+2$
misspelling corrected
Feb
25
comment Positivity of coefficients of Ehrhart polynomial of n-Tetrahedron
$T_2$ does not have integer vertices, so it does not have an Ehrhart polynomial. Let $M$ be the least common multiple of $d_1,\dots,d_n$. You could ask for each $0\leq j<M$ whether the polynomial $p_j(t)=L_{T_2}(tM+j)$ has positive coefficients.
Feb
20
awarded  Nice Answer
Feb
18
awarded  Notable Question
Feb
17
comment A search for theorems which appear to have very few, if any hypotheses
@Joe Silverman: I have done this for Greene's theorem. Later I will do it for the Greene-Kleitman theorem.
Feb
17
revised A search for theorems which appear to have very few, if any hypotheses
added an explanation of Greene's theorem
Feb
17
answered A search for theorems which appear to have very few, if any hypotheses
Feb
15
revised What's your favorite equation, formula, identity or inequality?
improved appearance of identity
Feb
15
comment What are fun elementary subjects in probability?
Some fun problems on probability theory are at ocw.mit.edu/courses/mathematics/…. Many of them can be gateways to further discussion.
Feb
14
awarded  Popular Question
Feb
14
awarded  Good Question
Feb
13
awarded  Nice Question