Topic: invertible list of topics
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	Proof of a Unique Solution		2009-07-24
		From muele: Find matrix A such that A is not invertible, and b such that Ax=b has a unique solution Answered by Robert J. Dawson.
	If the matrix A is inverible and AB =AC, then B = C		2002-03-27
		From Vikki: i hope you can help i am soooo stuck here goes: a) A= 0 1 B= 1 1 c= 2 5 0 2 3 4 3 4 A,B and c are matrices Evaluate AB and Ac (which I can do) then b) I need to prove that if the matrix A is inverible and AB =AC, then B = C. Why does this not contradict what happened in part a)? Answered by Leeanne Boehm.

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