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   The Tarski Undefinability Theorem
   Building on related logical issues, Alfred Tarski demonstrated in 1933 that a consistent formal language cannot contain its own truth predicate [8]. Tarski's Undefinability Theorem proves that if a language $L$ is sufficiently rich to formalize elementary arithmetic (and thus contain its own Gödel numbering), then any predicate defined within $L$ claiming to express the truth of sentence…