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Matamaitic » Loighic & Tacartheoiric Tacar éigríochta, gur féidir a bhaill a chomhaireamh e.g. is tacair éigríochta inchomhairthe iad tacar na n-uimhreacha aiceanta agus tacar na slánuimhreacha ach ní hea tacar na réaduimhreacha uile ná tacar na n-uimhreacha cóimheasta uile.
Mathematics » Logic & Set Theory An infinite set, the members of which are countable e.g. the set of natural numbers or the set of integers are both countably infinite sets but the set of all real numbers or the set of all rational numbers are not.