Might mean (unverified): Non-negative eigenvalues for symmetric matrices.
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We found one dictionary that defines the word semidefiniteness:

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  1. semidefiniteness: Wiktionary

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Definitions from Wiktionary (semidefiniteness)

▸ noun:  The condition of being semidefinite

Similar:
semivariability, semidecidability, semi-decidability, semicontinuity, demipositivity, semipositivity, semidecision, semiprimitivity, semisimplicity, variationality, more...

Opposite:
indefiniteness, non-definiteness, unboundedness

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Similar:
semivariability, semidecidability, semi-decidability, semicontinuity, demipositivity, semipositivity, semidecision, semiprimitivity, semisimplicity, variationality, more...

Opposite:
indefiniteness, non-definiteness, unboundedness



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