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(0) = - 查题网

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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∈X $\wedge$ x<y}，则R1(0) =

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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