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Matamaitic » Loighic & Tacartheoiric Bíonn dhá thacar (nó breis) scartha mura mbíonn aon bhall coiteann iontu. Is comhionann a n-idirmhír agus an tacar neamhnitheach nó folamh.
Mathematics » Logic & Set Theory Two (or more) sets are disjoint if they have no common element. Their intersection is identical to the null or empty set.