An Introduction to the Theory of Algebraic Surfaces - download pdf or read online

By Oscar Zariski

ISBN-10: 354004602X

ISBN-13: 9783540046028

Zariski offers a superb creation to this subject in algebra, including his personal insights.

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Extra resources for An Introduction to the Theory of Algebraic Surfaces

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Notice that K (A ) is additive. , if f and g are composable and if one out of f , g is homotopic to zero, then the composition gf is homotopic to zero; moreover, if f and g are homotopic to zero, then f ⊕ g is homotopic to zero). Thus, K (A ) can be obtained from Ch (A ) by factoring out the ideal of chain maps which are homotopic to zero. The suspension functor on Ch (A ) is defined by Σ : A → A[1] where (A[1])n = n+1 A , dnA[1] = −dn+1 A . It is an automorphism of Ch (A ) leaving the ideal of chain maps homotopic to zero invariant, therefore it induces an automorphism of K (A ), which we still denote by Σ.

17 17 19 24 24 25 26 26 27 28 29 30 1. 1. Thick Subcategories and Rickard’s Criterion. 1. Let (F, α) be a triangle functor K → K . Consider T = {X ∈ K : F (X) ∼ = 0}. Then T is a strictly full triangulated subcategory such that X ⊕Y ∈T ⇒ X, Y ∈ T for all X, Y ∈ K. Proof. By its definition T is closed under isomorphisms in K. To prove T triangulated, apply the five lemma for triangulated categories. The last fact follows from the additivity of F : the only direct summands of zero objects are zero objects.

The composite functor K+ (I ) → K+ (A ) → D+ (A , E ) is a fully faithful triangle functor. 1. 1, Lemma, b)] using the assumption on enough injectives. Constructing a quasi-inverse k for i amounts to choosing for each object in D+ (A , E ) an isomorphic object in the image of i. 2. This establishes point (i). 5], again one uses the assumption on enough injectives. 4. Equivalences of Derived Categories. The above construction can be seen as a very special instance of the following general construction: Let us be given an exact category (A , E ) and a full additive subcategory B ⊂ A which is closed under extensions in the sense that for each sequence in E of the form B A B with B and B in B the object A belongs to B as well.

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An Introduction to the Theory of Algebraic Surfaces by Oscar Zariski

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