Fundamenta Informaticae 170 (2019) 223–240 223 DOI 10.3233/FI-2019-1861 IOS Press Neighbourhood and Lattice Models of Second-Order Intuitionistic Propositional Logic Toshihiko Kurata∗† Faculty of Business Administration Hosei University 2-17-1 Fujimi, Chiyoda-ku, Tokyo 102-8160, Japan
[email protected] Ken-etsu Fujita† Department of Computer Science Gunma University 1-5-1 Tenjin-cho, Kiryu-shi, Gunma 376-8515, Japan
[email protected] Abstract. We study a version of the Stone duality between the Alexandrov spaces and the com- pletely distributive algebraic lattices. This enables us to present lattice-theoretical models of second-order intuitionistic propositional logic which correlates with the Kripke models intro- duced by Sobolev. This can be regarded as a second-order extension of the well-known corre- spondence between Heyting algebras and Kripke models in the semantics of intuitionistic propo- sitional logic. Keywords: second-order intuitionistic propositional logic, complete Heyting algebra, complete- ness theorem ∗Address for correspondence: Faculty of Business Administration, Hosei University, 2-17-1 Fujimi, Chiyoda-ku, Tokyo 102-8160, Japan. †This research is dedicated to Professor Paweł Urzyczyn on the occasion of his 65th birthday. The authors are supported by JSPS KAKENHI Grant Number JP17K05343. They also would like to thank the referees for their valuable comments and suggestions. Th is article is published online with Open Access and distributed under the terms of the Creative Commons Attribution Non-Commercial License (CC BY-NC 4.0). 224 T. Kurata and K. Fujita / Neighbourhood and Lattice Models 1. Introduction Taking into account semantic aspects of intuitionistic propositional logic, we can find at least two types of model presentation [1, 2, 3], both of which enable us to show soundness and completeness of the formal system.