在全总个体域下，用一阶逻辑将命题“凡是汽车就比火车慢，这是不对的”符号化，下面不正确的为

>> 成人高等教育 / 离散数学（上）

成人高等教育 / 离散数学（上）

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A、
$\neg \forall$ x $\forall$ y(F(x) $\wedge$ G(y) $\mapsto$ H(x,y)), 其中, F(x): x 是汽车, G(y): y 是火车, H(x,y):x 比 y 慢.
B、
$\exists$ x $\exists$ y(F(x) $\wedge$ G(y) $\wedge$ $\neg$ 其中, F(x): x 是汽车, G(y): y 是火车, H(x,y):x 比 y 慢.
C、
$\neg \forall$ x (F(x) $\mapsto \forall$ y (G(y) $\mapsto$ H(x,y))), 其中, F(x): x 是汽车, G(y): y 是火车, H(x,y):x 比 y 慢.
D、
$\exists$ x $\exists$ y(F(x) $\wedge$ G(y) $\mapsto \neg$ H(x,y) ), 其中, F(x): x 是汽车, G(y): y 是火车, H(x,y):x 比 y 慢.

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离散数学（上）

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