gives True if m is explicitly indefinite, and False otherwise.

Details and OptionsDetails and Options

  • A matrix m is indefinite if its Hermitian part is neither a positive nor a negative semidefinite matrix.
  • IndefiniteMatrixQ works for symbolic as well as numerical matrices.
  • For approximate matrices, the option Tolerance->t can be used to indicate that all eigenvalues λ satisfying λt λmax are taken to be zero where λmax is an eigenvalue largest in magnitude.
  • The option Tolerance has Automatic as its default value.
Introduced in 2014