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Severi varieties on ruled surfaces over elliptic curves

Xiaotian Chang, Xi Chen and Adrian Zahariuc

Vol. 343 (2026), No. 2, 343–369
Abstract

We prove that the general members of Severi varieties on an Atiyah ruled surface over a general elliptic curve have nodes and ordinary triple points as singularities.

Keywords
Severi variety, deformation theory
Mathematical Subject Classification
Primary: 14C25, 14C30, 14H10, 14H52
Milestones
Received: 31 December 2024
Revised: 16 February 2026
Accepted: 13 April 2026
Published: 22 May 2026
Authors
Xiaotian Chang
Division of Mathematical Sciences
Nanyang Technological University
Singapore
Xi Chen
Department of Mathematical and Statistical Sciences
University of Alberta
Edmonton, AB
Canada
Adrian Zahariuc
Department of Mathematics and Statistics
University of Windsor
Windsor, ON
Canada

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