Never mind, I doubt the posistive triangular matrices is closed under inverses. But: Certainly the group of positive diagonal matrices would work. Anything else? —Dan
On Feb 24, 2016, at 12:27 PM, Dan Asimov <asimov@msri.org> wrote:
Would lower triangular square matrices (i.e., including the diagonal) with positive entries work?
—Dan
On Feb 24, 2016, at 11:50 AM, Veit Elser <ve10@cornell.edu> wrote:
On Feb 24, 2016, at 2:13 PM, Dan Asimov <dasimov@earthlink.net <mailto:dasimov@earthlink.net>> wrote:
[If]
M = A x B
, then for any kxk matrix G having an inverse H we also have
M = (AxG) x (HxB)
. . . Fun puzzle: what group of matrices (for insertion) preserves non-negativity?
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