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Matamaitic » Loighic & Tacartheoiric Is ionann abairt oscailte agus ráiteas ina bhfuil athróg agus a ndéantar tairiscint de nuair a chuirtear ball den uilethacar in ionad na hathróige sin. Má tharlaíonn an athróg níos mó ná uair amháin san abairt oscailte, ní mór an ball céanna den uilethacar a chur ina hionad gach uair.
Mathematics » Logic & Set Theory An open sentence is a statement which contains a variable and which becomes a proposition when an element of the universal set is substituted for this variable. If the variable occurs more than once in the open sentence, the same element of the universal set must be substituted for it at each occurance.