Contrapositive

Japanese: 対偶 - たいぐう

〘Noun〙① (━suru) Two things that form a set. In a pair. ※Kan'ei-published Honmōkyūshō (c. 1529), 6: "In reality, they are in opposition, but I fear they will not become a married couple." ※Nihon Fukeiron (1894), by Shiga Shigetaka, 4: "The ever-changing appearance of these clouds contrasts with the stillness and immobility of those waters." ② A type. Also. A member of the same family. ③ A husband and wife. Partner. Spouse. [Shunju Zuo Zhuan Commentary - Shōkō 2nd year] ④ (━suru) Rhetorically, placing two opposing things side by side. Couple (tsuiku) . ※Ensho Shonin no Gyojyo (1302) "A famous monk must teach _two _pairs of contrapositives, using law _against _law and metaphor _against _metaphor ." ※Lessons (1783) 9 "Although many of the place names in this country are used in poetry and are elegant, there are quite a few that should be used as contrapositives ." ⑤ In contrast to a proposition of the form "If A, then B," this is a proposition of "If it is not B, then it is not A." The former is also the contrapositive of the latter. The truth and negation of a proposition and its contrapositive (proposition) are the same. ※Chichi Keimo (1874) <Nishi Amane> Vol. 2 "In the contrapositive method, if the sign of negation is made affirmative, then we obtain B, which is the contrapositive of T." ⑥ A mechanical mechanism that combines two mechanical elements that come into contact with each other. For example, an axle and a bearing, or a bolt and a nut.

Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information

Japanese:

〘名〙① (━する) 二つで一そろいになっていること。つい。※寛永刊本蒙求抄（1529頃）六「当は対偶している事ぢゃが、夫婦にえなるまいと恐るるぞ」※日本風景論（1894）〈志賀重昂〉四「此雲の変幻出没と彼水の寂静不動と対偶す」② たぐい。とも。なかま。③ 夫婦。つれあい。配偶。〔春秋左伝疏‐昭公二年〕④ (━する) 修辞上、相対した二つの物事をならべて置くこと。対句(ついく)。※円照上人行状（1302）「名僧唱導必用_二対偶_一、以_レ法対_レ法、以_レ喩対_レ喩」※授業編（1783）九「此邦の地名も詩中に用て雅馴なるも多く対偶(タイクウ)すべきもすくなからず」⑤ 「ＡならＢ」というかたちの命題に対し、「ＢでなければＡではない」という命題。前者は、また後者の対偶となっている。命題とその対偶（命題）の正否は一致する。※致知啓蒙（1874）〈西周〉下「対偶法にて、其否定の標しを、肯定となせば、丁の対偶なる乙を得」⑥ 機械の機構で、相接触する二つの機械要素を組み合わせたもの。軸と軸受け、ボルトとナットなど。

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