[理工] [離散]二元關係的性質
想請問第18題的(b)
同時具備對稱與遞移性但不具反身性
我自己舉出來的例子是
{(1,2).(2,1).(1,1)}
但答案寫的是空集合
請問我舉的例子哪邊有錯呢?
如果觀念有錯也請大大指教><
謝謝
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