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November 23rd, 2008, 06:34 AM  #1 
Newbie Joined: Nov 2008 Posts: 3 Thanks: 0  Proof AB = 0 ? B = 0, A invertible
How do I go about proving this? That if A is an invertible matrix then AB = 0 ? B = 0? And what about this: AX = AY ? X = Y? Thanks.

November 23rd, 2008, 02:58 PM  #2 
Senior Member Joined: Oct 2007 From: Chicago Posts: 1,701 Thanks: 3  Re: Proof AB = 0 ? B = 0, A invertible
Since A is invertible, you can multiply by A^(1) on the right side of each expression... that's it. Do that, and the proof will follow.


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