if norm(AX)>=c*norm(X), for all X in Rn, and c>0 then how to get: if AX=0, then X=0?? thanks!!! I got it , sorry for bothering
Last edited by violetsf; Oct 31st 2007 at 05:59 PM.
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Originally Posted by violetsf if norm(AX)>=c*norm(X), for all X in Rn, and c>0 then how to get: if AX=0, then X=0?? thanks!!! I got it , sorry for bothering norm(AX) >= c*norm(X) >= 0 because c>0 and norm(X)>=0. So if AX=0 then 0>= c*norm(X) >= 0.
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