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The time-reversal operator.
The program assumes the Kramers-paired storage for the wavefunction.
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.|
Returns the rank of the operator.
Returns the representation of the operator.