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modus tollens

/ ˈməʊdəs ˈtɒlˌɛnz /

noun

  1. logic the principle that whenever a conditional statement and the negation of its consequent are given to be true, the negation of its antecedent may be validly inferred, as in if it's Tuesday this must be Belgium and this isn't Belgium so it's not Tuesday


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Word History and Origins

Origin of modus tollens1

literally: mood that denies

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modus ponensmodus vivendi