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So what do you think the negation of this logic proposition is:

All cars are not red

I think the negation of this is: All cars are red.

There is a car that does not fit a description of a coupe. 

I think the negation for this statement is: There is a car that does fit a description of a coupe.

Am I correct on these propositional logic

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All cars are not red.

该陈述的严格逻辑解释是“所有汽车都是红色以外的颜色”或等价的“不存在红色汽车”,否定就是“存在红色汽车”。另一方面,这种形式的陈述(例如“所有闪闪发光的不是金子”,“所有喝酒的人都不是诗人”)的传统英语解释是“存在一辆不是红色的汽车”;对此的否定是“所有汽车都是红色的”。

There is a car that does not fit a description of a coupe.

对此的否定是“没有不符合轿跑车描述的汽车”,或者等效地是“每辆车都是轿跑车”。这等同于“有一辆汽车确实符合轿跑车的描述”(即“轿跑车存在”),因为它不断言轿跑车(或任何汽车)存在。

于 2013-09-14T22:31:04.673 回答