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Nov 18, 2012 at 19:09 vote accept user28178
Nov 18, 2012 at 12:23 history edited Daniel Spector CC BY-SA 3.0
Added an example
Nov 18, 2012 at 12:11 history edited Daniel Spector CC BY-SA 3.0
Answer comment; added 2 characters in body
Nov 17, 2012 at 22:22 comment added user28178 @Daniel Thanks for the answer. MM^T is symmetric and positive definite (by assumption), so a theorem says all the eigenvalues are positive. This is enough, right?
Nov 17, 2012 at 19:14 history answered Daniel Spector CC BY-SA 3.0