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- Giuseppe Castagna, Giorgio Ghelli, Giuseppe Longo
- LISP and Functional Programming
- 1992

We present a simple extension of typed λ-claculus where functions can be <italic>overloaded</italic> by adding different “pieces of code”. In short, the code of an overloaded function is formed by several branches of code; the branch to execute is chosen, when the function is applied, according to a particular selection rule which depends… (More)

- Luca Cardelli, Giorgio Ghelli
- Mathematical Structures in Computer Science
- 2004

The ambient logic is a modal logic proposed to describe the structural and computational properties of distributed and mobile computation. The structural part of the ambient logic is, essentially, a logic of labeled trees, hence it turns out to be a good foundation for query languages for semistructured data, much in the same way as first order logic is a… (More)

Fibonacci is a strongly typed, object-oricntcd database programming language with a new mechanism to model objects with roles. Traditional object-oriented programming languages do not have the possibility of changing dynamically the type of an object to model the bchaviour of real world entities which change their status over time. This is a severe… (More)

- Luca Cardelli, Giorgio Ghelli, Andrew D. Gordon
- IFIP TCS
- 2000

We add name groups and group creation to the typed ambient calculus. Group creation is surprisingly interesting: it has the eeect of statically preventing certain communications, and can thus block the accidental or malicious escape of capabilities that is a major concern in practical systems. Moreover, ambient groups allow us to reene our earlier work on… (More)

- Luca Cardelli, Philippa Gardner, Giorgio Ghelli
- ICALP
- 2002

- Luca Cardelli, Giorgio Ghelli, Andrew D. Gordon
- Inf. Comput.
- 2002

The ambient calculus is a concurrent calculus where the unifying notion of ambient is used to model many different constructs for distributed and mobile computation. We study a type system that describes several properties of ambient behavior. The type system allows ambients to be partitioned in disjoint sets (groups), according to the intended design of a… (More)

- Giuseppe Castagna, Giorgio Ghelli, Francesco Zappa Nardelli
- CONCUR
- 2001

The issue of this work is how to type mobility, in the sense that we tackle the problem of typing not only mobile agents but also their movement. This yields higher-order types for agents. To that end we first provide a new definition of the Seal Calculus that gets rid of existing inessential features while preserving the distinctive characteristics of the… (More)

- Anuj Dawar, Philippa Gardner, Giorgio Ghelli
- Inf. Comput.
- 2007

We investigate the complexity and expressive power of a spatial logic for reasoning about graphs. This logic was previously introduced by Cardelli, Gardner and Ghelli, and provides the simplest setting in which to explore such results for spatial logics. We study several forms of the logic: the logic with and without recursion, and with either an… (More)

- Giuseppe Castagna, Giorgio Ghelli, Giuseppe Longo
- TLCA
- 1993

- Dario Colazzo, Giorgio Ghelli
- LICS
- 1999

The problem of defining and checking a subtype relation between recursive types was studied in [3] for a first order type system, but for second order systems, which combine subtyping and parametric polymorphism, only negative results are known [17]. This paper studies the problem of subtype checking for recursive types in system kernel Fun, a… (More)