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Transactions of the American Mathematical Society

ISSN 1088-6850(online) ISSN 0002-9947(print)



Canonical embeddings

Authors: J. Morrow and H. Rossi
Journal: Trans. Amer. Math. Soc. 261 (1980), 547-565
MSC: Primary 32J25; Secondary 14H99
MathSciNet review: 580902
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Abstract: In this paper the authors compare the embedding of a compact Riemann surface in its tangent bundle to the embedding as the diagonal in the product. These embeddings are proved to be first, but not second, order equivalent. The embedding of a hyperelliptic curve in its tangent bundle is described in an explicit way. Although it is not possible to be so explicit in the other cases, it is shown that in all cases, if the Riemann surface R has genus greater than two, then the blowdown of the zero section of the tangent bundle and the blowdown of the diagonal in the product have the same Hilbert polynomial.

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Keywords: Grauert blow down, compact Riemann surface, tangent bundle, diagonal, tangent cone, canonical embedding, hyperelliptic, local ring, Noether's theorem, Hilbert polynomial
Article copyright: © Copyright 1980 American Mathematical Society