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Matamaitic » Loighic & Tacartheoiric Chun gur ball de thacar fírinne abairte oscailte é ball x atá ina bhall den uilethacar is gá agus is leor gur tairiscint fhíor atá mar thoradh ar é a chur in ionad na hathróige.
Mathematics » Logic & Set Theory An element x which is a member of the universal set, is an element of the truth set of an open sentence if and only if its substitution results in a true proposition.