May 11th, 2013, 09:33 AM  #1 
Newbie Joined: Dec 2012 Posts: 3 Thanks: 0  Gram matrix
Hi everbody, i have to proof, that for a comlex matrix A is invertible if is positive definite. That means for every and we know that Do you have any ideas how to proof this? I'm not allowed to use any criterion based on eigenvalues. Thank you very much 

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