題組內容
6. Let $A = \{a, b, c, d\}$ and let $R = \{(a, b), (b, c), (c, d), (d, b)\}$ be a relation on $A$. (10 分)
(B) Determine the transitive closure $R^*$ of R.
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6. Let $A = \{a, b, c, d\}$ and let $R = \{(a, b), (b, c), (c, d), (d, b)\}$ be a relation on $A$. (10 分)
(B) Determine the transitive closure $R^*$ of R.