LawOfExceptions

The exception proves the rule.

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There is an exception to every rule, except this rule.

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On its face, the law of exceptions is absurd according to ClassicalLogic. Yet it is indeed quite true in that even it has an exception. In Truth the statement involves self-reference and is undecidable by Godel. It is a good example of undecidability and perhaps a basic principle of the nature of Truth.