The Filbert Matrix

Details The Filbert Matrix The Filbert Matrix

1999-05-12

arxiv.org/abs/math/9905079v1

Fibonacci Quart. 39 (2001), no. 3, 268--275.

Mathematics

Rings and Algebras

9 pages; submitted to The Fibonacci Quarterly

Scientific paper

A Filbert matrix is a matrix whose (i,j) entry is 1/F_(i+j-1), where F_n is the nth Fibonacci number. The inverse of the n by n Filbert matrix resembles the inverse of the n by n Hilbert matrix, and we prove that it shares the property of having integer entries. We prove that the matrix formed by replacing the Fibonacci numbers with the Fibonacci polynomials has entries which are integer polynomials. We also prove that certain Hankel matrices of reciprocals of binomial coefficients have integer entries, and we conjecture that the corresponding matrices based on Fibonomial coefficients have integer entries. Our method is to give explicit formulae for the inverses.

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