Contraposition

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Contraposition

 

the law of traditional logic that holds that if from a certain proposition A there follows the proposition B, then from the negation of the proposition B follows the negation of the proposition A (or in the language of conditional propositions: from the truth of the proposition “If A, then B” follows the truth of the proposition “If not B ?, then not- A”).

REFERENCES

Church, A. Vvedenie v matematicheskuiu logiku. Moscow, 1960. (Translated from English.)
Tarski, A. Vvedenie v logiku i metodologiiu deduktivnykh nauk. Moscow, 1948. (Translated from English.)
References in periodicals archive ?
The ideas of both Karakoc and Erbakan about a civilizational contraposition between Islam and the Western world represent a connection with the early 19th century Pan-Islamism.
The child's action seems to be no longer interpreted as just simple opposition, but also as a form of complex contraposition, via which not only does she oppose the adult, but also 'proposes' an action.
ii) As emotions of radical contrapositions and ultimate destinies, the number and quality of epic emotions must always be geared (with some precision) to the number and nature of the values that have active currency in social life.