Even sets of nodes and Gauss genus theory
Algebraic Geometry
2021-08-31 v2
Abstract
We observe that a lemma used in the study of even sets of nodes on surfaces applies almost verbatim to prove a celebrated formula of Gauss on the 2-torsion of the class group of a quadratic field.
Cite
@article{arxiv.2106.15667,
title = {Even sets of nodes and Gauss genus theory},
author = {Arnaud Beauville},
journal= {arXiv preprint arXiv:2106.15667},
year = {2021}
}
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