Non-finite axiomatizability of dynamic topological logic

Author:

Fernández-Duque David1

Affiliation:

1. Universidad de Sevilla

Abstract

Dynamic topological logic (DTL) is a polymodal logic designed for reasoning about dynamic topological systems . These are pairs 〈 X , f 〉, where X is a topological space and f : XX is continuous. DTL uses a language L which combines the topological S4 modality □ with temporal operators from linear temporal logic. Recently, we gave a sound and complete axiomatization DTL * for an extension of the logic to the language L * , where ◊ is allowed to act on finite sets of formulas and is interpreted as a tangled closure operator. No complete axiomatization is known in the language L, although one proof system, which we shall call KM, was conjectured to be complete by Kremer and Mints. In this article, we show that given any language L' such that L ⊆ L' ⊆ L * , the set of valid formulas of L' is not finitely axiomatizable. It follows, in particular, that KM is incomplete.

Funder

Instituto Tecnológico Autónomo de México

Publisher

Association for Computing Machinery (ACM)

Subject

Computational Mathematics,Logic,General Computer Science,Theoretical Computer Science

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