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On second order intuitionistic propositional logic without a universal quantifier

Published online by Cambridge University Press:  12 March 2014

Konrad Zdanowski*
Affiliation:
Instytut Matematyczny Pan, Sniadeckich 8, 00-956 Warszawa, Poland, E-mail: K.Zdanowski@impan.gov.pl

Abstract

We examine second order intuitionistic propositional logic, IPC2. Let a be the set of formulas with no universal quantification. We prove Glivenko's theorem for formulas in that is, for φ, φ is a classical tautology if and only if ┐┐φ is a tautology of IPC2. We show that for each sentence φ (without free variables), φ is a classical tautology if and only if φ is an intuitionistic tautology. As a corollary we obtain a semantic argument that the quantifier ∀ is not definable in IPC2 from ⊥, ⋁, ⋀, →, ∃.

Type
Research Article
Copyright
Copyright © Association for Symbolic Logic 2009

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References

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