# need ur help [closed]

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

need ur help [closed]

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

close date 2013-10-05 15:50:52

Asked: **
2013-10-05 03:35:23 -0600
**

Seen: **35 times**

Last updated: **Oct 05 '13**

elementary matrices for elementary row operations

How do I identify the set of words of given length in matrix generators

Generating random normal vectors and matrices

How does one detect cyclic vectors in SAGE?

Substitution using Dictionary with Matrix as Value

problems with product of vector of symbols with square matrix

Matrices not equal, but entries are. Why?

Tensor Product of Two Matrices coming from Algebra Representations

Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.

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.