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