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逆換 (ぎゃっかん) Japanese meaning | Kotomora

逆ぎゃっ換かん

also: ぎゃくかん

ぎゃ

っ

か

ん

Meanings

1

noun

logical inversion

Technical term in logic for reversing a proposition or relation. Rare in everyday language.

「AならばB」の逆ぎゃっ換かんは「BでないならばAでない」である。
The logical inversion of 'If A then B' is 'If not B then not A'.

Written forms

逆換
- ぎゃっかん
  Standard kanji form; the reading ぎゃっかん is a contraction of ぎゃくかん.
- ぎゃくかん
  Uncontracted reading; less common than ぎゃっかん.
ぎゃくかん

Kanji

逆inverted, reverse, opposite
換interchange, period, change

Similar words

逆ぎゃく
逆 is a general word for 'reverse' or 'opposite', while 逆換 is a specific logical term.
対たい偶ぐう
対偶 is the standard term for 'contraposition' in logic, which is closely related to 逆換.

Etymology

Compound of 逆 (reverse) and 換 (exchange/change). The reading ぎゃっかん is a contraction of ぎゃくかん.