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Jan
19
answered Determinant of discrete Laplacian
Jan
15
comment Characters of permutation groups
I would have called (1) the exponential formula :)
Dec
21
awarded  Popular Question
Dec
10
comment Does the Grothendieck ring of varieties contain torsion?
I seem to recall that Zakharevic had a theorem along the lines of: The kernel of multiplication by $\mathbb L$ is generated by examples like the one by Borisov. I wonder if that has any implications here.
Dec
8
awarded  Yearling
Nov
21
awarded  Nice Answer
Nov
18
answered Primes $P_{2n-1}$ that are $2$ mod $3$
Nov
12
comment Alternating sign binomial identity
Hint: $(-1)^{m-t-j}\binom{m-1-j}{t-1}=\binom{-t}{m-t-j}$.
Nov
5
answered Volume of the convex hull of the set of all graphic sequences of a given length
Nov
3
comment Positivity of coefficients of the inverse of a certain power series
I wonder if the strengthening $\sum_{s\geq 0}\binom{7k+s}{s}_q\binom{7k+1}{k-3s}_q (-1)^s\in \mathbb N[q]$ is true?
Oct
31
awarded  Nice Question
Oct
30
comment Zero curves of Tutte Polynomials?
I remember asking a question about these curves a while back, but there is no answer yet. mathoverflow.net/questions/103491/…
Oct
29
revised Subsets of [1..N] with no three-term arithmetic progressions and no large gaps
added 64 characters in body
Oct
29
answered Subsets of [1..N] with no three-term arithmetic progressions and no large gaps
Oct
28
answered Sign of 3j symbol (in view of interpolation)
Oct
27
revised An identity involving a product of two binomial coefficients
added 274 characters in body
Oct
27
answered An identity involving a product of two binomial coefficients
Oct
27
awarded  mg.metric-geometry
Oct
26
answered Combinatorial description of a 120-cell
Oct
17
awarded  ag.algebraic-geometry