選擇公理曰:有非空集族(記曰「 α ∈ A \}_} 」),可各取一物(記曰「 x α ∈ X α \in X_} 」),聚以成族(記曰「 α ∈ A \}_} 」)。
或曰:有天(「F」),甲映射乙(「」)者,則有地(「f」),甲映射乙物之並也(記曰「」),且地之象屬天之象耳(記曰「」)。
或曰:有集甲(「A」),其物非空。則有集乙(「B」),凡甲物(記曰「a ∈ A」)交之,必有一物也(記曰「a∩B={x}」)。
有如下等價公理。
良序公理曰:集皆有良序也。
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