Abstraction, Refinement and Proof for Probabilistic Systems by Annabelle McIver

By Annabelle McIver

Probabilistic innovations are more and more being hired in machine courses and platforms simply because they could bring up potency in sequential algorithms, permit differently nonfunctional distribution functions, and make allowance quantification of chance and safeguard commonly. This makes operational types of the way they paintings, and logics for reasoning approximately them, tremendous important.

Abstraction, Refinement and evidence for Probabilistic Systems offers a rigorous method of modeling and reasoning approximately desktops that contain chance. Its foundations lie in conventional Boolean sequential-program logic—but its extension to numeric instead of only true-or-false judgments takes it a lot extra, into components reminiscent of randomized algorithms, fault tolerance, and, in disbursed structures, almost-certain symmetry breaking. The presentation starts off with the generic "assertional" form of application improvement and maintains with expanding specialization: half I treats probabilistic application good judgment, together with many examples and case reports; half II units out the specific semantics; and half III applies the method of complicated fabric on temporal calculi and two-player games.

Topics and features:

* offers a common semantics for either likelihood and demonic nondeterminism, together with abstraction and information refinement

* Introduces readers to the most recent mathematical study in rigorous formalization of randomized (probabilistic) algorithms * Illustrates via instance the stairs precious for construction a conceptual version of probabilistic programming "paradigm"

* Considers result of a wide and built-in study workout (10 years and carrying on with) within the modern quarter of "quantitative" software logics

* comprises necessary chapter-ending summaries, a accomplished index, and an appendix that explores replacement approaches

This obtainable, centred monograph, written by means of foreign experts on probabilistic programming, develops a necessary starting place subject for contemporary programming and platforms improvement. Researchers, laptop scientists, and complex undergraduates and graduates learning programming or probabilistic structures will locate the paintings an authoritative and crucial source text.

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Additional info for Abstraction, Refinement and Proof for Probabilistic Systems

Sample text

Thus writing “≡, , ” as we do elsewhere is just an alternative for the text “in all states”. 34 1. Introduction to pGCL Proof We use the healthiness conditions of the previous section, and we assume that the post-expectations postE, postE are bounded above by some nonzero M . postE . scaling scaling [post ] is standard; postE/M 1 The opposite inequality is immediate (in all states) from the monotonicity healthiness property, since [post ] ∗ postE postE. postE . above assumption about postE, postE as above, but for postE ✷ This kind of reasoning is nothing new for standard programs, and indeed is usually taken for granted (although its formal justification appeals to conjunctivity).

The use of multiplication in the idiom [G] ∗ I is just a convenient way of writing I if G else 0, with the effect in this case of restricting the probabilistic implication to require proof only in states satisfying G: 4 We now dispense with the distinction between Boolean- and {0, 1} types for standard predicates, and overload the -style and wp operators in order to reduce the occurrence of embedding-brackets [·]. In particular we use for “everywhere implies” between predicates as well as “is everywhere no more than” between expectations, to achieve a consistency of notation.

Termination example: self-stabilisation . . . . 1 Variations on the ring . . . . . . . Uncertain termination . . . . . . . . . 1 Example: an inductive termination argument Proper post-expectations . . . . . . . . 1 The martingale revisited . . . . . . Bounded vs. unbounded expectations . . . . . 1 Unbounded invariants: a counter-example . Informal proof of the loop rule . . . . . . . . . . . . . . . . 38 2. 1 Introduction: loops via recursion We saw in Chap.

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