qiskit/releasenotes/notes/0.19/add-opflow-is-hermitian-met...

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---
features:
- |
Added the :meth:`.OperatorBase.is_hermitian` method to check whether the
operator is Hermitian or not. :class:`~qiskit.algorithms.NumPyEigensolver`
and :class:`~qiskit.algorithms.NumPyMinimumEigensolver` use ``eigh`` or
``eigsh`` to solve the eigenvalue problem when the operator is Hermitian.