need ur help [closed]

asked 2013-10-05 10:35:23 +0100

Teeqi gravatar image

prove that rank(A?B)?rank(A)?rank(B) where A and B are n*n matrices

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Closed for the following reason question is off-topic or not relevant by kcrisman
close date 2013-10-05 22:50:52


Again, Sage cannot *prove* such things. You can of course do `A = matrix([0]); B = matrix([1]); rank(A)*rank(B) == rank(A*B)` to get `True` but that is not a proof.

kcrisman gravatar imagekcrisman ( 2013-10-05 22:50:47 +0100 )edit