DORT makes use of this operator in scattering problems, while Wigner's theorem is typically used to conclude this operator is anti-unitary and so this is sometimes named for Wigner.
Kramer's degeneracy theorem uses the effects of this operator on the electric field to show that systems with an odd number of electrons must remain doubly degenerate in the absense of a magnetic field. DORT makes use of this operator in scattering problems, while Wigner's theorem is typically used to conclude this operator is anti-unitary and so this is sometimes named for Wigner. Because it is non-increasing, Boltzmann's H-theorem would preclude the existance of this operator. Another result on this operator states that a process that lacks a certain symmetry cannot be made from processes that have it; that objection is named for Loschmidt. In any Lorentz invariant theory the symmetry of this operation is equivalent to the symmetries of charge and parity acting together according to the CPT theorem. FTP, name this process which could make a broken wineglass spontaneously reform.
Kramer's degeneracy theorem uses the effects of this operator on the electric field to show that systems with an odd number of electrons must remain doubly degenerate in the absense of a magnetic field.
{Time Reversal} Operator [accept equivalents, prompt on {CP} or {Charge Parity} before "{CP}" is mentioned, prompt on "{T}," prompt on "{Wigner's}" {operator} before mentioned]