Enum Hermiticity

• Defined in File attr.hpp

Enum Documentation

enum class sequant::Hermiticity

describes the abstract symmetry of a tensorial object under (Hermitian) adjoint, i.e. whether the abstract tensor equals (Hermitian), equals minus (AntiHermitian), or is unrelated to (NonHermitian) its own adjoint.

Unlike BraKetSymmetry this is a field-agnostic property of the abstract tensor: e.g. a 2-electron integral is Hermitian whether the computation is real or complex, a cluster amplitude is NonHermitian in either. The observable bra<->ket exchange symmetry (BraKetSymmetry) is the derived composition of this trait with the ambient Field (see to_braket_symmetry): Hermitian becomes Symm over a real field and Conjugate over a complex one; the remaining cases become Nonsymm.

Note

AntiHermitian cannot yet be represented in BraKetSymmetry (which lacks the antisymmetric cases) and therefore currently derives to Nonsymm; the trait is recorded for forward compatibility.

Values:

enumerator Hermitian

enumerator AntiHermitian

enumerator NonHermitian