By Zhaohui Luo

ISBN-10: 0198538359

ISBN-13: 9780198538356

This booklet develops a sort concept, reviews its houses, and explains its makes use of in computing device technological know-how. The booklet focuses specifically on how the research of variety concept may well supply a strong and uniform language for programming, application specification and improvement, and logical reasoning. the kind idea constructed right here displays a conceptual contrast among logical propositions and computational information varieties. ranging from an advent of the elemental strategies, the writer explains the that means and use of the type-theoretic language with proof-theoretic justifications, and discusses a variety of concerns within the learn of kind concept. the sensible use of the language is illustrated through constructing an method of specification and information refinement in kind concept, which helps modular improvement of specification, courses, and proofs. scholars and researchers in laptop technology and common sense will welcome this intriguing new booklet.

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Extra info for Computation and reasoning. A type theory for computer science

Sample text

Sloman lists among others non-synchronous parallel processes, continuous (analog) processes and chemical processes that are all involved in the human brain (Sloman 1996, 181). It is an acceptable claim that non-Turing machine computation is not subject to Gödel’s theorem. Benacerraf agrees that Lucas’s claim against mechanism is insufficient, if mechanism entails “nonTuring machine” computing. It is an open question whether certain things which do not satisfy Turing’s specifications might also count as machines (for the purpose of Mechanism).

This leads to a very interesting condition, when we compare two “copies” of a formal system against each other. Each copy would contain Gödel sentences, which can only be specified by the other copy. There are two more points in Lucas’s argument, which give rise to some concerns. Lucas’s argument rests on the assumption that the mind can always apply some method to a Turing machine to show that this particular Turing machine contains an unprovable statement. He claims that a mind can “see” that such statements are true, while the machine, because of Gödel’s theorem, cannot prove them to be true.

Moreover, the machine states, the tape 14 Wells describes a Turing machine as a quadruple (K, Σ, δ, s) omitting the accept state and reject state of Sisper’s model. Wells also incorporates the tape alphabet (Γ) into Σ. (Wells 1996, 35) 15 This is a matter of convention. Any symbol can be used as a marker to denote the end of the input, as long as it is reflected in the machine table of that particular machine. 34 alphabet and the transition functions, are all expressed in terms of elements of finite sets.

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Computation and reasoning. A type theory for computer science by Zhaohui Luo

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