Read e-book online Unifying Theories of Programming: First International PDF

By Steve Dunne, Bill Stoddart

ISBN-10: 354034750X

ISBN-13: 9783540347507

This ebook constitutes the completely refereed post-proceedings of the 1st foreign Symposium on Unifying Theories of Programming, UTP 2006, held at Walworth fortress, County Durham, united kingdom, in February 2006. The e-book offers 14 revised complete papers. in accordance with the pioneering paintings on unifying theories of programming via Tony Haare and Jifeng He, UTP 2006 excited by the main major effects and raised wisdom of the advantages of unifying theoretical frameworks.

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Read or Download Unifying Theories of Programming: First International Symposium, UTP 2006, Walworth Castle, County Durham, UK, February 5-7, 2006, Revised Selected Papers ... Computer Science and General Issues) PDF

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Extra resources for Unifying Theories of Programming: First International Symposium, UTP 2006, Walworth Castle, County Durham, UK, February 5-7, 2006, Revised Selected Papers ... Computer Science and General Issues)

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50 J. He and T. 4. } s Ha ; ⎯ ⎯→ ; U {ind. } = U = s T ; ⎯⎯ ⎯→ ; U = = = T ⊆ ⊑ T;⊑ ⊆ ⊑ ⊆ ⊑ ⊆ ⊑ Corollaries. 5. 6. Proof: {because ≤ ⊆ ⊑} = s Corollaries. 7. Corollary. } ⎯⎯→ ⎯ ; T∪ ; ⊑ = Corollary. 3, which are not applicable to the transition rule that defines T. CSP is a Retract of CCS 51 It follows that the trace model of CSP is a retract of CCS modulo strong simulation. It remains to explore the other models of CSP in relationship with other orderings over CCS; these orderings give special roles to hidden symbols and to barbs.

Y = y ≡ true x = (BAccount , {id → (Z, 1), . }) ∧ y = y Notice that if we had not initialized the variable x , the assignment would not be well-deﬁned and would abort. The same behaviour would occur if we had tried to access the attribute bonus of the BAccount instance: since the variable has type Account , we cannot access variables from its subclass instance. 3 33 Conditional We need to redeﬁne the conditional to consider the well-deﬁnedness of the condition. P ✁ e ✄ Q =df D(P ✁ e ✄ Q ) ∧ ((ev ∧ P ) ∨ (¬ev ∧ Q )) For example, suppose we have that self = (BAccount , {.

Methods are higher-order, predicatevalued variables as in the theory of higher-order procedures and parameters of the UTP. The parameters of m are those in pds and an extra parameter self to represent the target of a call; its type is Object. Just as in var x , where we introduce in the alphabet new variables x and x , with meth A m, we introduce in the alphabet the variables m and m . At the same time, we use a design to deﬁne the value of m . For the case of a redeﬁnition of a method m (m ∈ α(meth A m = (pds • p))), we have the deﬁnition below.

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