The Expressiveness of Looping Terms in the Semantic Programming

We consider the language of $Δ_0$-formulas with list terms interpreted over hereditarily finite list superstructures. We study the complexity of reasoning in extensions of the language of $Δ_0$-formulas with non-standard list terms, which represent bounded list search, bounded iteration, and bounded recursion. We prove a number of results on the complexity of model checking and satisfiability for these formulas. In particular, we show that the set of $Δ_0$-formulas with bounded recursive terms true in a given list superstructure $HW(\mathcal{M})$ is non-elementary (it contains the class kEXPTIME, for all $k\geqslant 1$). For $Δ_0$-formulas with restrictions on the usage of iterative and recursive terms, we show lower complexity.

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