2026-09-23T05:05:24Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/303562022-01-13T07:54:35Zcom_1721.1_7582com_1721.1_7581col_1721.1_131022
Aise Johan de Jong.
Testa, Damiano
Massachusetts Institute of Technology. Dept. of Mathematics.
Massachusetts Institute of Technology. Department of Mathematics
2006-03-21T21:07:56Z
2006-03-21T21:07:56Z
2005
2005
http://hdl.handle.net/1721.1/30356
61214410
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mathematics, 2005.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references (p. 141-142).
Let X be a smooth projective surface and choose a curve C on X. Let VC be the set of all irreducible divisors on X linearly equivalent to C whose normalization is a rational curve. The Severi problem for rational curves on X with divisor class [C] consists of studying the irreducibility of the spaces VC as C varies among all curves on X. In this thesis, we prove that all the spaces VC are irreducible in the case where X is a del Pezzo surface of degree at least two. If the degree of X is one, then we prove the same result only for a general X, with the exception of V-KX, where KX is the canonical divisor of X. It is well known that for general del Pezzo surface of degree one, V-KX consists of twelve points, and thus cannot be irreducible.
by Damiano Testa.
Ph.D.
142 p.
727261 bytes
724193 bytes
application/pdf
application/pdf
eng
Massachusetts Institute of Technology
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http://dspace.mit.edu/handle/1721.1/7582
Mathematics.
The Severi problem for rational curves on del Pezzo surfaces
Thesis
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