命定悖論(英文:predestination paradox)係指一件事件引致下一件,但下一件事件同時又係第一件事件嘅起因。原則上,呢點唔符合邏輯,不過某啲故仔會講角色因為穿越時空而遇到命定悖論。例:主角坐時光機返到過去想避免一場火燭發生(火燭發生引致主角想返到過去),但主角喺未發生火燭嘅時間唔小心撞跌咗一盞煤油燈,搞到火燭(主角想返到過去引致火燭發生)。
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