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In the exception paradox, the statement "every rule has an exception" leads to a contradiction.
- Every rule has an exception.
- "Every rule has an exception." is a rule.
- There is a rule R without exception. (by 1. and 2.)
Since 3. is the negation of 1., there is a contradiction.
Variations on the paradox
- If everything is possible, then it is possible for anything to be impossible.
- The only rule is that there are no rules.
- The only thing certain is that there is nothing certain. This may be shortened to "Nothing is certain.".
- "Moderation in all things, including moderation", a quotation sometimes attributed to Petronius.
- Ignore all rules
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