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Algebraic geometry and arithmetic curves by Qing Liu

By Qing Liu

Creation; 1. a few themes in commutative algebra; 2. common homes of schemes; three. Morphisms and base switch; four. a few neighborhood homes; five. Coherent sheaves and Cech cohmology; 6. Sheaves of differentials; 7. Divisors and functions to curves; eight. Birational geometry of surfaces; nine. ordinary surfaces; 10. relief of algebraic curves; Bibilography; Index

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Example text

A presheaf F (of Abelian groups) on X consists of the following data: – an Abelian group F(U ) for every open subset U of X, and – a group homomorphism (restriction map) ρU V : F(U ) → F(V ) for every pair of open subsets V ⊆ U 34 2. General properties of schemes which verify the following conditions: (1) F(∅) = 0; (2) ρU U = Id; (3) if we have three open subsets W ⊆ V ⊆ U , then ρU W = ρV W ◦ ρU V . An element s ∈ F(U ) is called a section of F over U . We let s|V denote the element ρU V (s) ∈ F(V ), and we call it the restriction of s to V .

Let S be the multiplicative part Z \ {0} of Z[T ]. Then a prime ideal p ∈ A1Z is contained in f −1 ({0}) if and only if p ∩ Z = 0, which is equivalent to p ∩ S = ∅. 7(c). Let p be a prime number; then p ∈ f −1 (pZ) if and only if p ∈ p. 7(b) that we have a homeomorphism between f −1 (pZ) and Spec Fp [T ] = A1Fp . 1. Spectrum of a ring 29 To summarize, we see that Spec Z[T ] can be seen as a family of affine lines, parameterized by the points of Spec Z, and over fields of different characteristics. In a way, we have brought the affine lines A1Q , A1Fp together in a single space.

Proof Let t1 , . . , tr be a system of generators of I. Let us consider the surjective homomorphism of A-algebras φ : B = A[T1 , . . , Tr ] → A defined by φ(Ti ) = ti , and endow B with the m-adic topology, where m is the ideal generated by the Ti . For any n ≥ 1, we have φ(mn ) = I n . 3 that ˆ → Aˆ is surjective. Hence Aˆ is Noetherian by the proposition A[[T1 , . . , Tr ]] = B above. Let M , N be two I-adic A-modules. It is clear that the product topology on ˆ ⊕N ˆ. M ⊕ N = M × N is also the I-adic topology.

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