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Title: Injectivity radius and gonality of a compact Riemann surface
Authors: Hwang, J.-M.
To, W.-K. 
Issue Date: Feb-2012
Citation: Hwang, J.-M., To, W.-K. (2012-02). Injectivity radius and gonality of a compact Riemann surface. American Journal of Mathematics 134 (1) : 259-283. ScholarBank@NUS Repository.
Abstract: We obtain a sharp lower bound for the volumes of purely 1-dimensional complex analytic subvarieties in a geodesic tubular neighborhood of the diagonal of the Cartesian product of a compact Riemann surface with itself. This leads to a lower bound of the Seshadri number of the canonical line bundle of the Cartesian product with respect to the diagonal. As a consequence, we obtain an upper bound for the hyperbolic injectivity radii of compact Riemann surfaces of a fixed gonality. In particular, we obtain the limiting behavior of the gonalities of a tower of compact Riemann surfaces. We also give an application of our results to an invariant related to the ample cone of the symmetric product of a Riemann surface. © 2012 by The Johns Hopkins University Press.
Source Title: American Journal of Mathematics
ISSN: 00029327
DOI: 10.1353/ajm.2012.0007
Appears in Collections:Staff Publications

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