Download e-book for kindle: Algebraic theories : a categorical introduction to general by Jiří Adámek, ing.; Jiří Rosický; E M Vitale

By Jiří Adámek, ing.; Jiří Rosický; E M Vitale

ISBN-10: 0521119227

ISBN-13: 9780521119221

''Algebraic theories, brought as an idea within the Nineteen Sixties, were a basic step in the direction of a specific view of normal algebra. additionally, they've got proved very priceless in a number of parts of arithmetic and computing device technological know-how. This rigorously built e-book offers a scientific creation to algebra in response to algebraic theories that's available to either graduate scholars and researchers. it's going to facilitate Read more...

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By Jiří Adámek, ing.; Jiří Rosický; E M Vitale

ISBN-10: 0521119227

ISBN-13: 9780521119221

''Algebraic theories, brought as an idea within the Nineteen Sixties, were a basic step in the direction of a specific view of normal algebra. additionally, they've got proved very priceless in a number of parts of arithmetic and computing device technological know-how. This rigorously built e-book offers a scientific creation to algebra in response to algebraic theories that's available to either graduate scholars and researchers. it's going to facilitate Read more...

Show description

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Additional info for Algebraic theories : a categorical introduction to general algebra

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13 is a standard result of category theory, which can be found in Mac Lane (1998). The fact that sifted colimits play an analogous role for algebraic categories as filtered colimits play for the locally finitely presentable categories was presented in Ad´amek and Rosick´y (2001). 3 Reflexive coequalizers An important case of sifted colimits are reflexive coequalizers. We will see in Chapter 7 that in algebraic categories, sifted colimits are just a combination of filtered colimits and reflexive coequalizers.

18 Corollary Every algebraic category is exact. In fact, since Set is exact, so is Set T . 3. 19 Definition We say that colimits in a category A distribute over products if given diagrams Di : Di → A (i ∈ I ), and forming the diagram Di → A, Ddi = D: i∈I Di di , i∈I the canonical morphism colim D → colim Di i∈I is an isomorphism. If all Di are of a certain type, we say that colimits of that type distribute over products. The concept of distributing over finite products is defined analogously but I is required to be finite.

2. The special case of a polynomial endofunctor H leads to -algebras. Indeed, for every one-sorted signature , the category -Alg is precisely the category H -Alg: if (A, a) is a H -algebra, then the operations Sifted and filtered colimits 29 σ A: An → A are the domain restrictions of a to the summand An corresponding to σ ∈ n . This case will be treated in Chapter 13. 26 Example An example of a finitary functor not preserving sifted colimits is the forgetful functor U: Pos → Set, where Pos is the category of posets and order-preserving maps.

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Algebraic theories : a categorical introduction to general algebra by Jiří Adámek, ing.; Jiří Rosický; E M Vitale


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