离散数学题目，英语的 10
WhichofthefollowingrelationRonA={1,2,3,4}doesnothaveasmallestpartialorderSsuchthatR&#...
Which of the following relation R on A={1,2,3,4} does not have a smallest partial order S such that R⊆S ? And Explain why.
(a). R={(1,4), (2,1), (3,2), (4,3)}
(b). R={(1,3), (2,2), (3,4), (4,2)}
(c). R={(1,2)}
(d). R={(2,2), (3,3), (4,4)} 展开
(a). R={(1,4), (2,1), (3,2), (4,3)}
(b). R={(1,3), (2,2), (3,4), (4,2)}
(c). R={(1,2)}
(d). R={(2,2), (3,3), (4,4)} 展开
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