User Ira Gessel

3 votes

Enumerating unlabeled trees with degree at most 3

answered May 17, 2013 at 3:36

3 votes

Accepted

What is the cardinality of the family of unlabelled bipartite graphs on n vertices?

answered Feb 4, 2013 at 3:40

3 votes

permutations rescuing chain/product rules?

answered Dec 21, 2016 at 18:06

3 votes

Combinatorial aspects of continued fractions

answered Mar 4, 2016 at 20:02

3 votes

Accepted

Identity involving shifted Legendre coefficients

answered Jul 23, 2014 at 13:40

3 votes

Accepted

Name for series $\sum f_n x^n / (n! (n+k)!)$

answered Oct 13, 2014 at 13:55

3 votes

Accepted

Draws from multiple non-disjoint urns

answered Oct 27, 2013 at 1:27

3 votes

Accepted

Number of subsets with fixed cardinality k, and sum of elements a multiple of m

answered Sep 12, 2013 at 3:17

3 votes

Reference request: enumeration under group action

answered May 18, 2014 at 15:43

3 votes

Accepted

Confusion in definition of class of structures and combinatorial class

answered Jan 11, 2022 at 21:55

3 votes

Comparing two power-series

answered Jul 25, 2021 at 3:47

3 votes

Important combinatorial and algebraic interpretations of the coefficients in the polynomial $[n]!_q = (1+q)(1+q+q^2) \ldots (1+q+\cdots + q^{n-1})$

answered Dec 28, 2019 at 18:28

3 votes

Accepted

Does this equation have an explicit solution?

answered Apr 11, 2017 at 16:08

3 votes

Proof of a combinatorial identity (possibly using trigonometric identities)

answered Feb 4, 2019 at 17:50

3 votes

Accepted

A question about generalized harmonic numbers modulo $p$

answered Jun 23, 2022 at 2:14

3 votes

Nonequivalent definitions in Mathematics

answered Sep 11, 2023 at 19:28

3 votes

A question on the real root of a polynomial

answered Feb 19, 2023 at 22:13

2 votes

Accepted

Terminology associated with mathematical induction

answered Feb 1, 2023 at 19:18

2 votes

Accepted

Showing equality of Eberlein polynomials

answered Sep 5, 2019 at 12:37

2 votes

Asymptotics for sum involving Euler numbers

answered Dec 22, 2018 at 16:19

2 votes

An explicit representation for polynomials generated by a power of $x/\sin(x)$

answered Aug 23, 2017 at 17:05

2 votes

Finite differences of Stirling numbers

answered Jul 12, 2018 at 1:04

2 votes

Bilinear recurrence relation between even Bernoulli numbers

answered Nov 27, 2019 at 21:33

2 votes

Upper bound for an infinite series of Pochhammer Symbol

answered Jun 11, 2021 at 22:38

2 votes

Accepted

Closed form for odd part of Bernoulli Polynomial generating function, $\sum_{k=0}^{\infty}B_{2k+1}(x)\frac{t^{2k+1}}{(2k+1)!}$

answered Oct 3, 2021 at 22:01

2 votes

Accepted

How is this combinatorial structure called?

answered Jun 2, 2014 at 14:56

2 votes

Accepted

Enumeration of labeled connected bipartite graphs given partite sets

answered Jul 15, 2013 at 17:30

2 votes

Reference request : an elementary product-sum formula for binomial coefficients

answered May 10, 2012 at 17:31

2 votes

Cyclically symmetric functions

answered Mar 24, 2013 at 17:21

2 votes

Accepted

Reference request on symmetric polynomials

answered Feb 26, 2013 at 19:30

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191 Answers

Enumerating unlabeled trees with degree at most 3

What is the cardinality of the family of unlabelled bipartite graphs on n vertices?

permutations rescuing chain/product rules?

Combinatorial aspects of continued fractions

Identity involving shifted Legendre coefficients

Name for series $\sum f_n x^n / (n! (n+k)!)$

Draws from multiple non-disjoint urns

Number of subsets with fixed cardinality k, and sum of elements a multiple of m

Reference request: enumeration under group action

Confusion in definition of class of structures and combinatorial class

Comparing two power-series

Important combinatorial and algebraic interpretations of the coefficients in the polynomial $[n]!_q = (1+q)(1+q+q^2) \ldots (1+q+\cdots + q^{n-1})$

Does this equation have an explicit solution?

Proof of a combinatorial identity (possibly using trigonometric identities)

A question about generalized harmonic numbers modulo $p$

Nonequivalent definitions in Mathematics

A question on the real root of a polynomial

Terminology associated with mathematical induction

Showing equality of Eberlein polynomials

Asymptotics for sum involving Euler numbers

An explicit representation for polynomials generated by a power of $x/\sin(x)$

Finite differences of Stirling numbers

Bilinear recurrence relation between even Bernoulli numbers

Upper bound for an infinite series of Pochhammer Symbol

Closed form for odd part of Bernoulli Polynomial generating function, $\sum_{k=0}^{\infty}B_{2k+1}(x)\frac{t^{2k+1}}{(2k+1)!}$

How is this combinatorial structure called?

Enumeration of labeled connected bipartite graphs given partite sets

Reference request : an elementary product-sum formula for binomial coefficients

Cyclically symmetric functions

Reference request on symmetric polynomials