Is it allowed to define a proposition as follows:(adsbygoogle = window.adsbygoogle || []).push({});

Proposition B = "Proposition B is not true"

Probably not, but what is theground reasonfor this? The fact that if you would be allowed to do that, that you'd come to a contradiction? That would imply that for defining any proposition, you first have to proof that it is possible to define a proposition as such? Does this sometimes get very tricky?

Thank you,

mr. vodka

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# Self-referencing definition

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