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    Descriptive complexity results like Fagin's theorem presu... — Carmelics
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    Challenges→P ≠ NP if and only if there exists a class of ordered structures definable in existential second-order logic that is not definable by any formula of FO(LFP).

    Descriptive complexity results like Fagin's theorem presuppose fixed finite ordered structures, but the P vs NP problem ranges over all computational models regardless of representational assumptions.

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    Key Terms

    Computational models(as used in computer science)
    Theoretical frameworks that describe how computers process information and solve problems, used to understand what's possible to calculate.
    Fagin's theorem(named after the logician Ronald Fagin)
    A mathematical logic result proven by Ronald Fagin showing that a certain type of logical language can express exactly the problems that computers can solve efficiently (a class called NP).
    Finite ordered structures(as used in mathematical logic)
    Mathematical objects with a limited number of elements arranged in a specific sequence or hierarchy; think of a small list of numbers arranged from smallest to largest.
    P vs NP problem(as used in computational complexity theory)
    One of the biggest unsolved questions in computer science asking whether problems that are hard to solve are also hard to check if an answer is correct; most computer scientists suspect they're different, but no one has proven it.

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    Representational assumptions(as used in logic and computer science)
    Underlying beliefs or conditions about how information is stored, formatted, or presented when solving a problem.
    descriptive complexity(Descriptive complexity theory, contrasted with computational complexity)
    A measure of a problem's complexity in proportion to the logical resources required to describe its instances, defined using formulas that characterize the problem's instances relative to an appropriate background class of finitary structures.

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    Modality & Possibility1 linkedPhilosophy of Language1 linked

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    P ≠ NP if and only if there exists a class of ordered structures definable in ex...

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