[philosophy] The Exclusion principle is a philosophical principle that states: ==In physicalism== The exclusion principle is most commonly applied when one poses this scenario; One usually considers that the desire to lift one’s arm as a mental event, and the lifting on one`s arm, a physical event. According to the exclusion principle, th...
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http://en.wikipedia.org/wiki/Exclusion_principle_(philosophy)

No two electrons can have the same set of quantum numbers. This statement also applies to protons, neutrons, and other baryons. See also: Bose-Einstein Statistics, Electron, Hadrons, Neutron, Proton.
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https://www.encyclo.co.uk/local/20687

the principle that in any system described by quantum mechanics no two identical particles having spin equal to half an odd integer can be in the same quantum state: first postulated for the electrons in atoms. Also calledCf. fermion.
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https://www.infoplease.com/dictionary/exclusion-principle
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