Definition of "semidefinite" []

• Describing a bilinear form, over a vector space, that is either always positive or always negative (adjective)

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• "Posted Oct 30, 2006 at 7:13 PM | Permalink | Reply so there must be weaker conditions than positive semidefinite which still generate positive eigenvalues."
• "However you still seem to get positive eigenvalues – so there must be weaker conditions than positive semidefinite which still generate positive eigenvalues."
• "For a symmetric matrix M, eigenvalues are positive if and only if the M is positive semidefinite."