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FqeOperator base class.
contract( brastate: "Wavefunction", ketstate: "Wavefunction" ) -> complex
Given two wavefunctions, generate the expectation value of the operator according to its representation.
||Wavefunction on the bra side.|
||Wavefunction on the ket side.|
rank() -> int
Return the rank of this operator.
representation() -> str
Return the representation of the operator.