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Results tagged with formal-languages
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user 9896
The study of formal languages (sets of strings or trees over an alphabet), rewriting systems and algorithms, recognition automata/algorithms, and related questions.
3
votes
Which Turing machines accept the language of trivial words in a finitely presented group?
Given a Turing machine $T$, one can close it under the conditions (1), (2), (3) as follows. Given the word $w$, run machine $T$ on $w$ as well as all the words $w'$ obtained by concatenating, reducing …
- 3,475
3
votes
Graph properties: definability and decidability
Almost any language I can think of (FO theories, etc) isinvariant under isomorphism, i.e. if $\cal A$ satisfies the sentence $\sigma$ then so does $h(\cal A)$ for any isomorphism $h$. Hence if a class …
- 3,475