無限集合
無限集合係由無限個元素組成嘅集合，亦都叫做無窮集合。喺集合論入面，集合主要分為有限集合同無限集合，有限集合好多嘅性質都係顯而易見嘅，相反，因為無限集合嘅非有限性，所以無限集合嘅一啲基本性質反而變得唔明顯，個別嘅數學家甚至質疑諸如選擇公理等基本公設使用喺無限集合身上係咪重係啱。
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