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Ira Gessel's user avatar
Ira Gessel's user avatar
Ira Gessel's user avatar
Ira Gessel
  • Member for 14 years, 1 month
  • Last seen this week
  • Brandeis University, Waltham, MA, United States
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View all questions and answers
answer
65
Reason for breakdown of a nice binomial identity
Aug 3, 2022
answer
50
New binomial coefficient identity?
Jan 30, 2018
answer
40
The "square root" of a graph?
Mar 2, 2021
answer
32
Integrality of a sequence formed by sums
Jul 22, 2021
answer
30
The Matrix-Tree Theorem without the matrix
Aug 22, 2011
answer
29
Derivative formula
Feb 14, 2017
answer
25
Eulerian number identity
Apr 20, 2019
answer
25
Can a Bell number be a power of 2?
Aug 16, 2023
answer
25
Combinatorial meaning of the functional equation for logarithm
Nov 16, 2012
answer
24
power series of the reciprocal... does a recursive formula exist for the coefficients
Jan 26, 2011