Ira Gessel

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Name Ira Gessel
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37

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16
The Matrix-Tree Theorem without the matrix
14
Combinatorial meaning of the functional equation for logarithm
13
Number of closed walks on an $n$-cube
13
Show that this ratio of factorials is always an integer
13
Use of everywhere divergent generating functions
13
A particular combinatorial proof of Wilson’s theorem
11
formal power series convergence
10
Extremely messy proofs
10
Number of integer combinations x_1 < … < x_n ?
9
Interpolating a sum of binomial coefficients using a sin function
8
Counting card distributions when cards are duplicated
7
power series of the reciprocal… does a recursive formula exist for the coefficients.
7
Implications of a relation on algebraic numbers
7
Sum of products of exponentials and polynomials
7
Sign of coefficients
7
Faa di Bruno’s formula for inverse functions ?
6
generating function for regular tournaments
6
How does this relationship between the Catalan numbers and SU(2) generalize?
5
Polynomials from a Recurrence Relation
5
Circular Permutations With Identical Objects
5
Computer package for representation theory of the symmetric group
5
Name of certain combinatorial numbers?
4
Hypergeometric identities
4
How to prove recursion formulas for Stirling numbers?
4
Identifying factors of higher order in a determinant
4
hypergeometric closed form for z=1/4,-1/3
3
Zeros of “exponential” function
3
Enumerating unlabeled trees with degree at most 3
3
trigonometric identity needed for sums involving secants
2
Reference request on symmetric polynomials
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