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contrapose
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contrapose
contraˈpose, v. [f. L. contrāpōnĕre, with substitution of -pose for -pone: see compose, repose.] 1. trans. To set in opposition, or over against each other. Hence contraposed ppl. a.1617 Salkeld Treat. Paradise 235 (L.) We may manifestly see contraposed death and life. 1620 Shelton Quix. III. xxix. ...
Oxford English Dictionary
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contrapposto
‖ contrapposto (kontrapˈposto) [It., pa. pple. of contrapporre, f. L. contrāpōnĕre contrapose v.] In the visual arts, the arrangement of a figure so that the action of arms and shoulders contrasts as strongly as possible with that of hips and legs; a twisting of the figure on its own axis. Also fig....
Oxford English Dictionary
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counterpose
counterpose, v. rare. (kaʊntəˈpəʊz) [f. counter- 1 + -pose, after L. contrāpōnĕre: see contrapone, -pose.] 1. trans. = contrapose.1657 S. W. Schism Disp. 64 To points which they accounted fundamental, I counterpos'd..such as they esteemed not-fundamental. 1665 J. Serjeant Sure-footing 62 When two Ca...
Oxford English Dictionary
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Contraposition of "P if and only if Q" I'm understanding the basic idea of contraposition, when it comes to propositional logic and writing proofs, but I'm having trouble figuring out what the contraposition of "P if ...
So contrapose those two and you get $Not(Q) \Rightarrow Not(P)$ and $Not(P) \Rightarrow Not(Q)$, otherwise written as $Not(P) \Leftrightarrow Not(Q)$
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