Download e-book for iPad: Algebraic and Coalgebraic Methods in the Mathematics of by Roy Crole (auth.), Roland Backhouse, Roy Crole, Jeremy

By Roy Crole (auth.), Roland Backhouse, Roy Crole, Jeremy Gibbons (eds.)

ISBN-10: 3540436138

ISBN-13: 9783540436133

Program development is set turning requisites of software program into implementations. fresh examine aimed toward bettering the method of application building exploits insights from summary algebraic instruments resembling lattice idea, fixpoint calculus, common algebra, type conception, and allegory theory.
This textbook-like instructional offers, along with an advent, 8 coherently written chapters through top specialists on ordered units and entire lattices, algebras and coalgebras, Galois connections and stuck element calculus, calculating sensible courses, algebra of software termination, workouts in coalgebraic specification, algebraic equipment for optimization difficulties, and temporal algebra.

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Read Online or Download Algebraic and Coalgebraic Methods in the Mathematics of Program Construction: International Summer School and Workshop Oxford, UK, April 10–14, 2000 Revised Lectures PDF

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Extra resources for Algebraic and Coalgebraic Methods in the Mathematics of Program Construction: International Summer School and Workshop Oxford, UK, April 10–14, 2000 Revised Lectures

Example text

Ordered structures and the maps between them provide a wealth of examples of categories and functors. Equally importantly perhaps, every poset gives rise to a category in a natural way. Such categories are highly special (every set of arrows has at most one element) but very simple. As we hint in Section 9, elementary order-theoretic notions provide instances of more abstract categorical notions. For example, product, supremum, and infimum are instances of product, colimit, and colimit. Further, Galois connections between posets are instances of adjunctions between categories.

This doesn’t quite work: we can have distinct propositions α and β for which α → β and β → α both hold. Thus → defines a pre-order rather than a partial order. To get a partial order we don’t distinguish α and β when α ↔ β. With this identification, which can be formalized in terms of the relation of logical equivalence on PROP, we do get a Boolean algebra. A brief account of the theory of Boolean algebras, including an elementary treatment of the role of lattice theory in propositional calculus, is given in ILO2, Chapter 4.

As an ordered structure it possesses extremely nice properties, with infinitary disjunction and conjunction (union and intersection) available and interacting in a optimally well-behaved way. Powersets are too nice! Programs built on pure set models cannot capture all the behaviours that one might wish. Ordered set models are richer. Probably some, but not all, of the ideas presented here will be familiar already to most readers. However, as befits concepts which have incarnations in a variety of disciplines, the concepts don different clothes in different settings.

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Algebraic and Coalgebraic Methods in the Mathematics of Program Construction: International Summer School and Workshop Oxford, UK, April 10–14, 2000 Revised Lectures by Roy Crole (auth.), Roland Backhouse, Roy Crole, Jeremy Gibbons (eds.)


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