Wigner's rule

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A result concerning the quantum statistics of systems with more than one fermion. If there are N fermions in the system and N is odd, then the total system is a fermion; but if N is even, the total system is a boson. Wigner's rule is named after Eugene Wigner, who discovered it in 1929. It was rediscovered independently by Paul Ehrenfest and Robert Oppenheimer in 1931.

Subjects: Physics.

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