Generating functions attached to some infinite matrices

Details Generating functions attached to some infinite matrices Generating functions attached to some infinite matrices

2009-06-10

arxiv.org/abs/0906.1836v1

Mathematics

Combinatorics

12 pages

Scientific paper

Let V be an infinite matrix with rows and columns indexed by the positive integers, and entries in a field F. Suppose that v_{i,j} only depends on i-j and is 0 for |i-j| large. Then V^n is defined for all n, and one has a "generating function" G=\sum a_{1,1}(V^n)z^n. Ira Gessel has shown that G is algebraic over F(z). We extend his result, allowing v_{i,j} for fixed i-j to be eventually periodic in i rather than constant. This result and some variants of it that we prove will have applications to Hilbert-Kunz theory.

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