Poly-Bernoulli numbers and lonesum matrices

Details Poly-Bernoulli numbers and lonesum matrices Poly-Bernoulli numbers and lonesum matrices

2011-03-25

arxiv.org/abs/1103.4884v1

Mathematics

Combinatorics

27 pages

Scientific paper

A lonesum matrix is a matrix that can be uniquely reconstructed from its row and column sums. Kaneko defined the poly-Bernoulli numbers $B_m^{(n)}$ by a generating function, and Brewbaker computed the number of binary lonesum $m\times n$-matrices and showed that this number coincides with the poly-Bernoulli number $B_m^{(-n)}$. We compute the number of $q$-ary lonesum $m\times n$-matrices, and then provide generalized Kaneko's formulas by using the generating function for the number of $q$-ary lonesum $m\times n$-matrices. In addition, we define two types of $q$-ary lonesum matrices that are composed of strong and weak lonesum matrices, and suggest further researches on lonesum matrices. \

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