Axiomatic-theory object languages can use higher-level natural-language terms {metalanguage} {syntax language}. Higher-level languages express theorems {metatheorem} about proofs, formal theories, languages, and logic [Hilbert, 1899] [Kleene, 1952] [Tarski, 1983]. Metamathematics is a metalanguage.
Mathematical Sciences>Mathematics>Axiomatic Theory>Metamathematics
3-Mathematics-Axiomatic Theory-Metamathematics
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Date Modified: 2022.0224