[seqfan] Re: Seq triangles that are unimodular

Neil Sloane njasloane at gmail.com
Fri Jul 14 16:13:48 CEST 2017

Newman's book on Integral Matrices is a good reference

Best regards

Neil J. A. Sloane, President, OEIS Foundation.
11 South Adelaide Avenue, Highland Park, NJ 08904, USA.
Also Visiting Scientist, Math. Dept., Rutgers University, Piscataway, NJ.
Phone: 732 828 6098; home page: http://NeilSloane.com
Email: njasloane at gmail.com

On Fri, Jul 14, 2017 at 9:10 AM, Peter Lawrence <peterl95124 at sbcglobal.net>

> Pascal’s triangle as a matrix turns out to be unimodular (inverse has all
> integer entries)
> Stirling numbers of first kind as matrix and of second kind are inverses
> of each other
> Fibonomal triangle as matrix is unimodular,  A010048, and A103910
> Gaussian Binomial Triangles turn out to be unimodular, e.g. A022166 and
> A135950
> Is there a theory of triangular unimodular matricies ?
> For a given rank they form a group under multiplication, is there a finite
> set
> of generators (it would seem not) ?, or a simple infinite set ?
> Any info or references would be appreciated
> Thanks,
> Peter A. Lawrence.
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