Download PDF by Ernest G. Manes: Algebraic Approaches to Program Semantics

By Ernest G. Manes

ISBN-10: 1461249627

ISBN-13: 9781461249627

ISBN-10: 1461293774

ISBN-13: 9781461293774

In the Thirties, mathematical logicians studied the proposal of "effective comput­ability" utilizing such notions as recursive services, A-calculus, and Turing machines. The Forties observed the development of the 1st digital pcs, and the subsequent twenty years observed the evolution of higher-level programming languages within which courses may be written in a handy type self reliant (thanks to compilers and interpreters) of the structure of any particular laptop. the advance of such languages led in flip to the overall research of questions of syntax, structuring strings of symbols that can count number as felony courses, and semantics, settling on the "meaning" of a application, for instance, because the functionality it computes in remodeling enter facts to output effects. a massive method of semantics, pioneered through Floyd, Hoare, and Wirth, is named statement semantics: given a specification of which assertions (preconditions) on enter info should still make sure that the consequences fulfill wanted assertions (postconditions) on output information, one seeks a logical facts that this system satisfies its specification. an alternate process, pioneered by way of Scott and Strachey, is termed denotational semantics: it deals algebraic suggestions for characterizing the denotation of (i. e. , the functionality computed via) a program-the houses of this system can then be checked via direct comparability of the denotation with the specification. This e-book is an creation to denotational semantics. extra particularly, we introduce the reader to 2 ways to denotational semantics: the order semantics of Scott and Strachey and our personal partly additive semantics.

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Algebraic Approaches to Program Semantics by Ernest G. Manes PDF

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Extra resources for Algebraic Approaches to Program Semantics

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4 Multifunctions its usual meaning, R E Rel(R, N) if R is the set of real numbers and if xRn means x 2 = n, and S E Rel(P, W) if pSw means w is the sister of p where P is a set of people and W is a set of women. " More precisely, for each f E Mfn(X, Y) define f* E Rel(X, Y) by xf*y if and only if y E f(x). Prove that fl-+ f* establishes a bijective (= injective and surjective) function from Mfn(X, Y) to Rel(X, Y). 3. 3 to multifunctions in Mfn(DTN, DTN). For function constructors, define (A 0···0 fd: using 4 (and 6): [fl' ..

4 Definition. For f E Mfn(X, Y), 9 E Mfn(Y, Z), their composition gf E Mfn(X, Z) is defined by gf(x) = {zEZlthere exists YEf(x) with zEf(Y)}. Indeed, it is immediate that if f E Mfn(P, P) is the "children" multifunction then ff E Mfn(P, P) is the "grandchildren" multifunction we desired. 5. 5 Let X be an input set and let Y be an output set. Beginning with an input x in X, a given algorithm simultaneously initiates a set of noninteracting computations. Some of these may not terminate and those that do may halt at different times.

P)) to be semantically equivalent. 4 Multifunctions 10. Prove that (p v q) and (q v p) are semantically equivalent. Prove, however, that if (p 0 q) =abb (if p then true else (if q then true else false)) then (p 0 q) and (q 0 p) are not semantically equivalent. 11. Prove that (p v q) and (I (( Ip) 1\ (Iq))) are semantically equivalent. 12. Write an FPF function f to compute the number of occurrences of the least value in a nonempty list of numbers. [Hint: a possible strategy is Step 0: Step 1: Step 2: Step 4:

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Algebraic Approaches to Program Semantics by Ernest G. Manes


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