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问答题
H1,H2,…是前提,C是结论,用真值表判断下列结论是否有效:
(a)H1:P→Q,H2:Q,C:P
(b)H1:P∨Q,H2:P→R,H3:Q→R,C:R
问答题
设A={1,2,3,4,5,6},定义A上的二元关系:
R1={(1,1),(2,2),(3,3),(4,4),(5,5),(6,6)}∪{(1,4),(2,3),(2,6),(3,2),(3,6),(4,1),(6,2),(6,3)}
R2={(1,2),(2,1),(2,2),(3,3),(4,4),(4,5)}
问答题
设A={1,2,3,4,5,6},定义A上的二元关系:
R1={(1,1),(2,2),(3,3),(4,4),(5,5),(6,6)}∪{(1,4),(2,3),(2,6),(3,2),(3,6),(4,1),(6,2),(6,3)}
R2={(1,2),(2,1),(2,2),(3,3),(4,4),(4,5)}