換かん質しつ換かん位いかんしつかんいじ字FuriganaMeanings1nouncontrapositionTechnical term in logic; refers to the inference that derives a new proposition by switching the subject and predicate and negating both.換かん質しつ換かん位いは伝でん統とう的てき論ろん理り学がくで用もちい
