设A={a,b,c},B={1,2},C={α,β},试求 P(A)×A 设集合A={1,2,3,4,5,6,7},下列
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设A={a,b,c},B={1,2},C={α,β},试求 P(A)×A 设集合A={1,2,3,4,5,6,7},下列各式定义的R都
设A={a,b,c},B={1,2},C={α,β},试求
P(A)×A
设集合A={1,2,3,4,5,6,7},下列各式定义的R都是A上的关系,试分别写出R的元素
1.R={|x整除y}
2.R={|0≤(x-y)≤3}
3.R={|y分之x是素数}
21.设A={a,b,c,d,e,f}上的划分为{{a,c,f},{b,d},{e}},试求此划分所对应的等价关系
试问:
若一颗树有2个度为2的顶点,1个度为3的顶点,3个度为4的顶点,没有度数大于4的顶点,则它有几个度为1的顶点?
试问:有且仅有一个顶点的入度为0,而其他顶点的入度均为1的有向图是否一定是有向树?若是,则证明之;若不是,则举反例说明
设A={a,b,c},B={1,2},C={α,β},试求
P(A)×A
设集合A={1,2,3,4,5,6,7},下列各式定义的R都是A上的关系,试分别写出R的元素
1.R={|x整除y}
2.R={|0≤(x-y)≤3}
3.R={|y分之x是素数}
21.设A={a,b,c,d,e,f}上的划分为{{a,c,f},{b,d},{e}},试求此划分所对应的等价关系
试问:
若一颗树有2个度为2的顶点,1个度为3的顶点,3个度为4的顶点,没有度数大于4的顶点,则它有几个度为1的顶点?
试问:有且仅有一个顶点的入度为0,而其他顶点的入度均为1的有向图是否一定是有向树?若是,则证明之;若不是,则举反例说明
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