tests whether m is a positive definite matrix.
- PositiveDefiniteMatrixQ[m] gives True if m is explicitly positive definite, and gives False if it is a matrix that is not positive definite.
- A Hermitian matrix m is considered positive definite if and only if all its eigenvalues are positive.
- PositiveDefiniteMatrixQ works with SparseArray objects.
- PositiveDefiniteMatrixQ works for symbolic as well as numerical matrices.
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