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Is gaol coibhéise é coibhneas na cothroime ó tá na hairíonna seo aige: 1. a = a 2. má tá a = b ansin tá b = a 3. má tá a = b agus má tá b = c, ansin tá a = c.
The relation equality is an equivalence relation as it has the properties: 1. a = a 2. if a = b then b = a 3. if a = b and if b = c, then a = c.