In the context of set theory and formal languages, a **decidable sublanguage** typically refers to a subset of a formal language in which the truth of statements can be determined algorithmically—meaning there exists a mechanical procedure (or algorithm) that can decide whether any given statement in that language is true or false. ### Key Concepts: 1. **Formal Language**: A set of symbols and rules for manipulating those symbols that can be used to construct statements.
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