> < ^ Date: Fri, 10 Aug 2001 11:48:24 +0100
^ From: Andrea Donafee <andrea.donafee@luton.ac.uk >
^ Subject: Question about determinants of matrices

Dear All,

We have the integral group ring ZA of the finitely generated abelian
group A. The abelian group is given by means of a presentation,
but will NOT necessarily be a standard presentation. (In practice it
will be the presentation obtained by abelianising a presentation of a
non abelian group G. eg, If G = <x, y; x^5y^3x^2y^-1> then
A = <X, Y ; XY=YX, X^7Y^2> )

We have an m-by-n matrix M with entries from ZA. Then for each
1 < k =< min{m, n}
we want to compute the determinants of all the k-by-k submatrices
of M. Attempting to call the function DeterminantMat for k > 2,
however, produces an error. Can anyone suggest a different
method to find such determinants?

Many Thanks


Andrea Donafee
Research Student
Department of Computing and Information Systems
University of Luton


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