An important difference between presupposition entailment is that presupposition, unlike entailment, is not vulnerable to negation. That is to say, if a sentence is negated, the original presupposition is still true. -湖北继续教育网网校

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An important difference between presupposition entailment is that presupposition, unlike entailment, is not vulnerable to negation. That is to say, if a sentence is negated, the original presupposition is still true.