Re: Complexity of qfisom()

Bill Allombert <[email protected]> Sat, 8 Jan 2022 11:08:08 +0100

Newsgroups	gmane.comp.mathematics.pari.devel
Message-ID	<YdliiIwQLMJxD5Y1@seventeen>

On Sat, Jan 08, 2022 at 09:36:43AM +0200, Georgi Guninski wrote:
> I read the Fine Manual, but didn't find the answer.
> qfisom(G,H) returns matrix S such that G=S^T H S.
> 
> 1. Must S be permutation matrix up to sign (-1 entry is possible)?

No. S must only be integral with determinant 1 or -1.

Cheers,
Bill

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