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Matamaitic » Loighic & Tacartheoiric Is ionann aontas (nó suim) na dtacar A agus B agus tacar na mball sin a bhaineann le ceann ar a laghad den dá thacar. Is mar a chéile é do líon níos mó de thacair, fiú do líon éigríochta.
Mathematics » Logic & Set Theory The union (or sum) of the sets A and B is the set of those elements which belong to at least one of the sets. Similarly, for a greater (even infinite) number of sets.