J Autom Reasoning https://doi.org/10.1007/s10817-018-9464-6 From Types to Sets by Local Type Deﬁnition in Higher-Order Logic 1 2 Ondrej ˇ Kuncar ˇ · Andrei Popescu Received: 31 March 2017 / Accepted: 20 April 2018 © Springer Science+Business Media B.V., part of Springer Nature 2018 Abstract Types in higher-order logic (HOL) are naturally interpreted as nonempty sets. This intuition is reﬂected in the type deﬁnition rule for the HOL-based systems (including Isabelle/HOL), where a new type can be deﬁned whenever a nonempty set is exhibited. However, in HOL this deﬁnition mechanism cannot be applied inside proof contexts.We propose a more expressive type deﬁnition rule that addresses the limitation and we prove its consistency. This higher expressive power opens the opportunity for a HOL tool that relativizes type-based statements to more ﬂexible set-based variants in a principled way. We also address particularities of Isabelle/HOL and show how to perform the relativization in the presence of type classes. Keywords HOL · Isabelle · Local typedef · Type deﬁnition · Relativization · Type classes · Overloading · Dependent types · Model · Consistency · Transfer · Type-based theorems · Set-based theorems 1 Motivation The proof assistant community is mainly divided in two successful camps.
Journal of Automated Reasoning – Springer Journals
Published: Jun 4, 2018
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