(quantum mechanics) The theorem that, if ψ is an eigenfunction of the Hamiltonian operator and R is a symmetry element of the Hamiltonian, then Rψ is an eigenfunction of the Hamiltonian having the same eigenvalue as ψ. Angular momentum of the electron spin is conserved in a collision of the second kind.
Wigner's theorem
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(′wig·nərz ′thir·əm)
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