exclusion principle

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exclusion principle Basic law of quantum mechanics, proposed by Wolfgang Pauli in 1925, stating no two electrons in an atom can possess the same energy and spin. More precisely, the set of four quantum numbers characterizing certain elementary particles called fermions must be unique.

exclusion principle

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exclusion principle A principle introduced in 1934 by the Russian ecologist G. F.Gause (1910–86), that two species cannot coexist in the same locality if they have identical ecological requirements.

exclusion principle

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exclusion principle See COMPETITIVE-EXCLUSION PRINCIPLE.

exclusion principle

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exclusion principle A principle, introduced by G. F. Gause, that two species cannot coexist in the same locality if they have identical ecological requirements.