ご指摘ありがとうございますm(__)m
Nekohebiさんの論法は「A⇒B」が真であるならば、「¬A⇒¬B」も真である っていう
裏の真偽が常に一致するという仮定の上で成り立ってるということですかね。
(対偶論法的アプローチだけど、対偶ではなくて裏だから証明にならない)
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