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ACM Transactions on Computer Systems (TOCS)
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Information and Computation
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Mobile objects in distributed Oz
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Mathematical Structures in Computer Science
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Theoretical Computer Science - Special issue: Foundations of wide area network computing
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OOPSLA '05 Proceedings of the 20th annual ACM SIGPLAN conference on Object-oriented programming, systems, languages, and applications
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Formalising Java RMI with explicit code mobility
Theoretical Computer Science
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Obliq is a lexically scoped, distributed, object-based programming language. In Obliq, the migration of an object is proposed as creating a clone of the object at the target site, whereafter the original object is turned into an alias for the clone. Obliq has only an informal semantics, so there is no proof that this style of migration is safe, i.e., transparent to object clients. In previous work, we introduced øjeblik, an abstraction of Obliq, where, by lexical scoping, sites have been abstracted away. We used øjeblik in order to exhibit how the semantics behind Obliq's implementation renders migration unsafe. We also suggested a modified semantics that we conjectured instead to be safe. In this paper, we rewrite our modified semantics of øjeblik in terms of the π-calculus, and we use it to formally prove the correctness of object surrogation, the abstraction of object migration in Øjeblik.