Download Abstract State Machines - Theory and Applications: by Egon Börger (auth.), Yuri Gurevich, Philipp W. Kutter, PDF

By Egon Börger (auth.), Yuri Gurevich, Philipp W. Kutter, Martin Odersky, Lothar Thiele (eds.)

This booklet constitutes the completely refereed post-proceedings of the foreign Workshop on summary nation Machines, ASM 2000, held in Monte Verita, Switzerland in March 2000.
The 12 revised complete papers provided have been rigorously reviewed and chosen from 30 submissions. additionally integrated are an introductory evaluation, experiences on commercial ASM functions, in addition to six contributions in response to invited talks. All in all, the quantity thoroughly offers the state-of-the-art in examine and functions of summary kingdom machines.

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Additional info for Abstract State Machines - Theory and Applications: International Workshop, ASM 2000 Monte Verità , Switzerland, March 19–24, 2000 Proceedings

Example text

Variable v becomes bound by the set constructor. The semantics is the obvious one of {t : v ∈ r and g}. Finally, rules express transitions between states by updating the dynamic functions. Elementary update rules are of the form f (t1 , . . , tj ) := t0 , where f is a dynamic function name (of arity j) and t1 , . . , tj are terms. The semantics is obvious. From elementary update rules more complex rules can be built by conditionals and parallel composition. More specifically: – If g is a boolean term and R1 and R2 are rules, then so is if g then R1 else R2 endif, again with the obvious semantics.

1 This language is the extension of first-order logic with the following features: (1) assignment to relation variables; (2) sequential composition; (3) while-loops; and (4) the introduction of new data elements in terms of tuples of existing ones. All computable queries can be expressed in while new . The complexity classes GENPSPACE and GEN-PTIME are obtained by putting polynomial space and time restrictions on while new programs. Abiteboul and Vianu illustrated the effect of such restrictions by showing that under a polynomial space restriction, while new programs can no longer check the parity of the cardinality of a set.

By P(k) will be denoted the TAE obtained after k applications of Time Propagation Rules. We define by induction on k time moments Tk , TAEs P(k), functions ρ(t) for t ≤ Tk , ρ+ (t) for t < Tk and also: – for every operator Op we define the set ExInt[Op, Tk ] of its intervals of execution of the form [a, b) by describing consecutively their left and right ends a and b situated to the left of Tk , – for every internal function f of type X → Z and X ∈ X we define a set V al[f, X, Tk ] of values to take as f (X) at some moment greater or equal to Tk , 40 J.

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