题目内容
The relation {(1, 3), (1, 4), (2, 3), (2, 4), (3, 1), (3, 4)} on the set {1, 2, 3, 4}, is symmetric? ()
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The relation {(2, 2), (2, 3), (2, 4), (3, 2), (3, 3), (3, 4)} on the set {1, 2, 3, 4}, is irreflexive? ()
The relation {(1, 1), (1, 2), (2, 1), (2, 2), (3, 3), (4, 4)} on the set {1, 2, 3, 4}, is irreflexive? ()
The relation {(2, 2), (2, 3), (2, 4), (3, 2), (3, 3), (3, 4)} on the set {1, 2, 3, 4}, is reflexive? ()
What rule of inference is used in the argument “If I go swimming, then I will stay in the sun too long. If I stay in the sun too long, then I will sunburn. Therefore, if I go swimming, then I will sunburn.” ( )
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