Negative-definite, Semidefinite and Indefinite Matrices
A Hermitian matrix is negative-definite, negative-semidefinite, or positive-semidefinite if and only if all of its eigenvalues are negative, non-positive, or non-negative, respectively.
Read more about this topic: Positive-definite Matrix
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“... indefinite visions of ambition are weak against the ease of doing what is habitual or beguilingly agreeable.”
—George Eliot [Mary Ann (or Marian)