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 成人高等教育 / 离散数学（上）
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设 Ri 是 X 上的二元关系, 对于 x∈X 定义集合Ri(x)={y|xRiy}. 如果 X={-4, -3, -2, -1, 0, 1, 2, 3, 4}, 且令R1={<x, y>|x, y∈Xx<y}，则R1(1) =

  • A、

    {1,2,3,4}；

  • B、

    {2,3,4}；

  • C、

    { -1,0}；

  • D、

    { -2, -1}。

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离散数学（上）
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