Questions tagged [finite-model-theory]

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38
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5answers
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Is there a logic without induction that captures much of P?

The Immerman-Vardi theorem states that PTIME (or P) is precisely the class of languages that can be described by a sentence of First-Order Logic together with a fixed-point operator, over the class of ...
17
votes
3answers
600 views

What is the minimal extension of FO that captures the class of regular languages?

Context: relations between logic and automata Büchi's Theorem states that Monadic Second Order logic over strings (MSO) captures the class of regular languages. The proof actually shows that ...