NNIL formulas are characterized via color-preserving monotonic maps, admit a finite universal model for each number of variables, and the resulting subframe logics are closed under arbitrary substructures.
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NNIL-formulas revisited: universal models and finite model property
NNIL formulas are characterized via color-preserving monotonic maps, admit a finite universal model for each number of variables, and the resulting subframe logics are closed under arbitrary substructures.