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Matamaitic » Loighic & Tacartheoiric Nuair a bhítear ag déileáil le tacar ar leith de nithe, glactar leis i gcónaí gur ann do thacar mór nó do uilethacar lena mbaineann na nithe go léir. D'fhéadfadh uilethacair éagsúla a bheith i gceist i gcásanna éagsúla, ach is ar uilethacar seasta a bheifí ag trácht le linn aon díospóireachta ar leith.
Mathematics » Logic & Set Theory When dealing with a given set of objects, there is always implied a large set or universal set to which all the objects belong. The universal set may vary from situation to situation, but is fixed for the duration of a particular discussion.