Bazsites.com Self Referential Sentences

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Self-Referential Sentences - Exhaustive lists of "This sentence has three a's" sentences.
Solve my base three numerical self-referential sentences puzzle! - The object of this difficult puzzle is to make four sentences mutually truthful by filling in base three numbers.

Wikipedia Articles

Diagonal lemma - In mathematical logic, the diagonal lemma or fixed point theorem establishes the existence of self-referential sentences in formal theories of arithmetic.Boolos and Jeffrey (1989, sec.