選擇公理
選擇公理（英文：Axiom of Choice，簡稱AC）係數學入面一條集合論公理。佢有幾種表達方式，其中一種係，畀一個由索引族 I 標籤嘅集合族 ( S i ) i ∈ I )_} ，當中每一個集都唔係空嘅，咁就存在一個方法，係每個集入面揀一個元素出嚟，形成 ( x i ) i ∈ I )_} 。另一個表達方法係，存在函數 f : I → ⋃ S i } ，符合 f ( i ) ∈ S i } ，呢個函數 f 叫做選擇函數。
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