By James D. Lewis

ISBN-10: 0821805681

ISBN-13: 9780821805688

This publication offers an creation to a subject of primary curiosity in transcendental algebraic geometry: the Hodge conjecture. which includes 15 lectures plus addenda and appendices, the amount is predicated on a chain of lectures introduced by way of Professor Lewis on the Centre de Recherches Mathematiques (CRM). The ebook is a self-contained presentation, thoroughly dedicated to the Hodge conjecture and similar subject matters. It contains many examples, and so much effects are thoroughly confirmed or sketched. the inducement at the back of some of the effects and history fabric is equipped. This finished method of the e-book supplies it a ``user-friendly'' sort. Readers needn't seek in other places for numerous effects. The publication is appropriate to be used as a textual content for a themes direction in algebraic geometry; comprises an appendix via B. Brent Gordon.

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**Example text**

Suppose 0 = g ∈ p. Then div(g/f ) ≥ 0 and whence g ∈ (f ). 4 Unique factorization Let us recall the classical theory for factorization in a noetherian domain A. Let P denote the set of principal ideals distinct form (0) and (1) ordered by inclusion. An element p ∈ P is called irreducible if it is maximal in that set. It follows easily from the noetherian hypothesis that any p ∈ P can be factored in irreducible elements. Let us call A a unique factorization domain if the factorization into irreducible elements is unique up to order of the factors.

Ar )M )p ) = 0, thus p ∈ Ass(M/(a1 , . . 29 dim(A/p) = dim(M ) − r. Since dim((M/(a1 , . . , ar )M )p ) = 0 we get depth((M/(a1 , . . , ar )M )p ) = 0 and whence depth(Mp ) = dim(Mp ). 6. 31. Suppose there exists a finitely generated Cohen–Macaulay module M with Supp(M ) = Spec(A). Then for any two prime ideals p ⊆ q we have dim(A/p) = dim(Aq /pq ) + dim(A/q). Proof. 30 that we can find a Cohen–Macaulay module N with p ∈ Ass(N ). 30 yields dim(A/q) + dimAp (Np ) = dim(N ). Since N and Nq are Cohen–Macaulay modules with p ∈ Ass(N ) and pq ∈ Ass(Nq ) we get dim(A/p) = dim(N ) and dim(Aq /pq ) = dim(Nq ).

7. If A is a normal domain and S a multiplicative subset of A, not containing 0, then S −1 A is a normal domain. 8. Let A denote a normal domain, q = 0 a finitely generated ideal. For a, b ∈ A aq ⊆ bq ⇒ (a) ⊆ (b). Proof. We may assume b = 0 and put f = a/b. We have qf ⊆ q and want to show that f ∈ A. Let x1 , . . , xd generate q. We can find a d × d-matrix U with entries in A such that x1 x1 .. .. f . = U . . xd xd This implies that det(U − f I) = 0. This is an integral equation for f and whence f ∈ A.

### A survey of the Hodge conjecture by James D. Lewis

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