整數同餘類是等價類最常見的例子
集合的這種除法又可派生出代數中商群和商映射的概念,很有趣
• 多謝!學習了,有了長進:) -大醬風度- ♂ (39 bytes) () 09/08/2024 postreply 10:01:30
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