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Matamaitic » Loighic & Tacartheoiric Tugtar athluaiteachas ar fhoirmle más gá agus más leor chun tairiscint fhíor a dhéanamh di go gcuirfí aon tairiscintí ar bith in ionad a cuid athróg.
Mathematics » Logic & Set Theory A formula is called a tautology if and only if it becomes a true proposition when any propositions whatsoever are substituted for its variables.