{"product_id":"homological-algebra-of-semimodules-and-semicontramodules-semi-infinite-homological-algebra-of-associative-algebraic-structures-von-leonid-positselski","title":"Homological Algebra of Semimodules and Semicontramodules","description":"\u003cp\u003eThesubjectofthisbookisSemi-In?niteAlgebra,ormorespeci?cally,Semi-In?nite Homological Algebra. The term ¿semi-in?nite¿ is loosely associated with objects that can be viewed as extending in both a ¿positive¿ and a ¿negative¿ direction, withsomenaturalpositioninbetween,perhapsde?nedupto ä?nite¿movement. Geometrically, this would mean an in?nite-dimensional variety with a natural class of ¿semi-in?nite¿ cycles or subvarieties, having always a ?nite codimension in each other, but in?nite dimension and codimension in the whole variety [37]. (For further instances of semi-in?nite mathematics see, e. g. , [38] and [57], and references below. ) Examples of algebraic objects of the semi-in?nite type range from certain in?nite-dimensional Lie algebras to locally compact totally disconnected topolo- cal groups to ind-schemes of ind-in?nite type to discrete valuation ?elds. From an abstract point of view, these are ind-pro-objects in various categories, often - dowed with additional structures. One contribution we make in this monograph is the demonstration of another class of algebraic objects that should be thought of as ¿semi-in?nite¿, even though they do not at ?rst glance look quite similar to the ones in the above list. These are semialgebras over coalgebras, or more generally over corings ¿ the associative algebraic structures of semi-in?nite nature. The subject lies on the border of Homological Algebra with Representation Theory, and the introduction of semialgebras into it provides an additional link with the theory of corings [23], as the semialgebrasare the natural objects dual to corings.\u003c\/p\u003e\u003cdiv class=\"aw-variant-hidden-subtitle-div\" id=\"aw-variant-subtitle-9783034604352\"\u003e\u003ch3\u003eSemi-infinite Homological Algebra of Associative Algebraic Structures\u003c\/h3\u003e\u003c\/div\u003e\u003cdiv class=\"aw-variant-hidden-subtitle-div\" id=\"aw-variant-subtitle-9783034803137\"\u003e\u003ch3\u003eSemi-infinite Homological Algebra of Associative Algebraic Structures\u003c\/h3\u003e\u003c\/div\u003e","brand":"Libri","offers":[{"title":"Hardcover - 9783034604352","offer_id":39629563166813,"sku":"9783034604352","price":53.49,"currency_code":"EUR","in_stock":true},{"title":"Softcover - 9783034803137","offer_id":39424016941149,"sku":"9783034803137","price":53.49,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/0622\/files\/73461_7f043083-69bd-4045-9f27-10f91c1c668b.jpg?v=1784779837","url":"https:\/\/shop.autorenwelt.de\/products\/homological-algebra-of-semimodules-and-semicontramodules-semi-infinite-homological-algebra-of-associative-algebraic-structures-von-leonid-positselski","provider":"Autorenwelt Shop","version":"1.0","type":"link"}