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We consider a semantics for a class-based object-oriented calculus based upon approximation; since in the context of LC such a semantics enjoys a strong correspondence with intersection type assignment systems, we also define such a system for our calculus and show that it is sound and complete. We establish the link with between type (we use the… (More)

We apply the principles of the intersection type discipline to the study of class-based object oriented programs and; our work follows from a similar approach (in the context of Abadi and Cardelli's ς-object calculus) taken by van Bakel and de'Liguoro. We define an extension of Featherweight Java, <i>p</i>FJ, and present a <i>predicate</i> system… (More)

We investigate the *model checking* problem for symbolic-heap separation logic with user-defined inductive predicates, i.e., the problem of checking that a given stack-heap memory state satisfies a given formula in this language, as arises e.g. in software testing or runtime verification. First, we show that the problem is *decidable*; specifically, we… (More)

We consider semantics for the class-based object-oriented calculus Featherweight Java (without casts) based upon approximation. We also define an intersection type assignment system for this calculus and show that it satisfies subject reduction and expansion, i.e. types are preserved under reduction and its converse. We establish a link between type… (More)

Jay and Given-Wilson have recently introduced the Factorisation (or SF-) calculus as a minimal fundamental model of intensional computation. It is a combinatory calculus containing a special combinator, F, which is able to examine the internal structure of its first argument. The calculus is significant in that as well as being combinatorially complete it… (More)

This paper presents a type assignment system with recursive types for Featherweight Java, inspired by the work of Nakano. Nakano's innovation consists in adding a modal type constructor which acts to control the folding of recursive types, resulting in a head-normalisation guarantee. We build on this approach by introducing a second modal type constructor… (More)

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