Download Selected papers on the classification of varieties and by David Mumford PDF

By David Mumford

These 30 articles span the years from 1961-1980 whereas David Mumford used to be an lively researcher within the quarter of algebraic geometry.  furthermore, all of the 3 sections is brought with by no means prior to released remark through David Gieseker, Eckart Viehweg, and George Kempf and Herbert Lange.

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Extra info for Selected papers on the classification of varieties and moduli spaces

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Let P be a point of V. If P lies in spec(R), then P corresponds to a prime ideal in R, and thus to the maximal ideal in the local ring R p • The point P is closed (in the Zariski topology) if and only if its corresponding ideal in R is maximal. If Dis a divisor, we can represent D as a sum D = l:n(W)W, 28 2. Proper Sets of Absolute Values. Divisors and Units with coefficients n(W) which are 0 for all but a finite number of prime divisors W. If n(W) # 0 we say that W is a component of D. The support of D, denoted ID I, or supp(D), is the set of points of V lying in some component of D.

Szpiro for the rest of this section, inspired by Arakelov [Ar 2]. First, we shall work with a single number field K, of degree N = [K : Q]. It will then be convenient to write divisors additively. Then by the definition of §5, a divisor is a formal linear combination D = Ln" 10g(Np)p " + L y(v)v, ° where n" is an integer for each prime ideal p of (= 0K); almost all n" = 0; and y(v) is an arbitrary real number. Each v E Soo corresponds to an embedding t1 v : K -+ C into the complex numbers, inducing the corresponding absolute value on K.

1. Let ep: V -+ W be an unramified covering of projective normal varieties defined over a field k with a proper set of discrete absolute 46 2. Proper Sets of Absolute Values. Divisors and Units values M K' There exists an element d E k such that for any point x E W(K) (where K is afinite extension of k), the discriminant of K(o/-l(X») over K divides d. The proof will result from a sequence of lemmas. First observe that we may assume that the covering is Galois. Indeed, let L be the smallest Galois extension of k(W) containing k(V), and let k' be the algebraic closure of k in L.

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