Abstract
We study definability of second-order generalized quantifiers. We show that the question whether a second-order generalized quantifier \({\mathcal{Q}}_1\) is definable in terms of another quantifier \({\mathcal{Q}}_2\), the base logic being monadic second-order logic, reduces to the question if a quantifier \({\mathcal{Q}}^{\star}_1\) is definable in \({\rm FO}({\mathcal{Q}}^{\star}_2,<,+,\times)\) for certain first-order quantifiers \({\mathcal{Q}}^{\star}_1\) and \({\mathcal{Q}}^{\star}_2\). We use our characterization to show new definability and non-definability results for second-order generalized quantifiers. In particular, we show that the monadic second-order majority quantifier Most1 is not definable in second-order logic.
The first author was supported by grant 127661 of the Academy of Finland. The second author was supported by NWO Vici grant 277-80-001.
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Kontinen, J., Szymanik, J. (2011). Characterizing Definability of Second-Order Generalized Quantifiers. In: Beklemishev, L.D., de Queiroz, R. (eds) Logic, Language, Information and Computation. WoLLIC 2011. Lecture Notes in Computer Science(), vol 6642. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-20920-8_20
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