Date: Mar 4, 2013 7:45 PM
Author: Ken.Pledger@vuw.ac.nz
Subject: Re: Matrix question

In article <mb2aj8dureebf24kpg9uv0o5athsbnn5lc@4ax.com>,
quasi <quasi@null.set> wrote:

> Ken Pledger wrote far too hastily:
> >
> >You can't mean that. It would just make every diagonal entry
> >1, and give you the identity matrix.

>
> What about an anti-diagonal matrix?
>
> What about a transposition matrix?
>
> What about any permutation matrix of order 2 -- that is,
> a permutation matrix P such that P^2 = I.
>
> The given condition is equivalent to the requirement that the
> matrix be a product of pairwise disjoint transpositions....



Yes, of course. I hereby shut up. :-(

Ken Pledger.