peirce's law

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الإنجليزية - الإنجليزية
The classically valid but intuitionistically non-valid formula ((P \to Q) \to P) \to P of propositional calculus, which can be used as an substitute for the law of excluded middle in implicational propositional calculus
peirce's law

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    () Named after the logician and philosopher Charles Sanders Peirce.
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