A positive semidefinite matrix is a Hermitian matrix all of whose eigenvalues are nonnegative.
A matrix may be tested to determine if it is positive semidefinite in the Wolfram Language using PositiveSemidefiniteMatrixQ[m].
A positive semidefinite matrix is a Hermitian matrix all of whose eigenvalues are nonnegative.
A matrix may be tested to determine if it is positive semidefinite in the Wolfram Language using PositiveSemidefiniteMatrixQ[m].
Weisstein, Eric W. "Positive Semidefinite Matrix." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/PositiveSemidefiniteMatrix.html