790 research outputs found

    Transcendence measures and algebraic growth of entire functions

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    In this paper we obtain estimates for certain transcendence measures of an entire function ff. Using these estimates, we prove Bernstein, doubling and Markov inequalities for a polynomial P(z,w)P(z,w) in C2{\Bbb C}^2 along the graph of ff. These inequalities provide, in turn, estimates for the number of zeros of the function P(z,f(z))P(z,f(z)) in the disk of radius rr, in terms of the degree of PP and of rr. Our estimates hold for arbitrary entire functions ff of finite order, and for a subsequence {nj}\{n_j\} of degrees of polynomials. But for special classes of functions, including the Riemann ζ\zeta-function, they hold for all degrees and are asymptotically best possible. From this theory we derive lower estimates for a certain algebraic measure of a set of values f(E)f(E), in terms of the size of the set EE.Comment: 40 page

    On the complete classification of extremal log Enriques surfaces

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    We show that there are exactly, up to isomorphisms, seven extremal log Enriques surfaces Z and construct all of them; among them types D_{19} and A_{19} have been shown of certain uniqueness by M. Reid. We also prove that the (degree 3 or 2) canonical covering of each of these seven Z has either X_3 or X_4 as its minimal resolution. Here X_3 (resp. X_4) is the unique K3 surface with Picard number 20 and discriminant 3 (resp. 4), which are called the most algebraic K3 surfaces by Vinberg and have infinite automorphism groups (by Shioda-Inose and Vinberg).Comment: 22 pages. Math. Z. to appea
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