A proof of a conjecture of Knuth.
A proof of the identities of Gordon and MacMahon and two new identities. (La démonstration des identités de Gordon et MacMahon et de deux identités nouvelles.)
A quantum field theoretical representation of Euler-Zagier sums.
A recursive relation for weighted Motzkin sequences.
A refinement of the formula for -ary trees and the Gould-Vandermonde's convolution.
A relation between restricted and unrestricted weighted Motzkin paths.
A Riordan array proof of a curious identity.
A Sequence of Exponential Numbers
A sextuple product identity with applications.
A short proof, based on mixed volumes, of Liggett's theorem on the convolution of ultra-logconcave sequences.
A short proof of a series evaluation in terms of harmonic numbers.
A short WZ-style proof of Abel's identity.
A simple bijection between binary trees and colored ternary trees.
A solution of Dedekind's problem on the number of isotone Boolean functions.
A WZ proof of a “curious” identity.
Accelerated series for universal constants, by the WZ method.
Adding to the argument of a Hall-Littlewood polynomial.
Advanced determinant calculus.
Algebraic categories whose projectives are explicitly free.
Almost product evaluation of Hankel determinants.