union by relation (اتِّحَادُ الإِضَافَة)

أصول الفقه

التعريف :

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Among the conditions stipulated by the logicians for [genuine] contradiction, namely for the affirmation and negation to pertain to the same thing. If they pertain to different things, then it is acceptable for the two statements to be true simultaneously or false simultaneously; this is not the kind of contradiction that is logically impossible.