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Non-catastrophic presupposition failure

The previous two sentences are a case in point. The first was, "I am going to talk about the F," the second was, "there is no F." If the second sentence is true -there is no F -then the first sentence, which presupposes that there is an F, suffers from presupposition failure. So it should strike us as somehow compromised or undermined. Yet it doesn't. So here is one example at least where presupposition failure is not a problem.