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Apr 8, 2013 at 15:43 comment added Dietrich Burde Do you assume that $K$ is an integer matrix ? Do you allow $Z=0$ and $t=0$, if the intersection of the ranges of $X$ and $Y$ is zero ? Then $t$ has nothing to do with $r$ and $s$.
Mar 28, 2013 at 22:24 comment added David Clarke P is a projector, but not necessarily integer.
Jan 25, 2013 at 11:55 comment added Mustafa Said I might be missing something but if $P$ is a projection, then $P^2=P$, so $t=1$?
Jan 22, 2013 at 2:23 history asked David Clarke CC BY-SA 3.0