[理工] [離散] 二元關係計數
有一題是這樣的
是二元關係
共有五個元素 構成5*5矩陣
問 reflexive and symmetric but not transitive
答案寫 2^10 - ΣS(5,i) (i從1~5) = 972
想請問 二元關係的話
reflexive and symmetric 不就代表transitive 成立了嗎?
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