A simple characteristic-free proof of the Brill-Noether theorem

Details A simple characteristic-free proof of the Brill-Noether theorem A simple characteristic-free proof of the Brill-Noether theorem

2011-08-24

arxiv.org/abs/1108.4967v1

Mathematics

Algebraic Geometry

9 pages, 1 figure

Scientific paper

We describe how the use of a different degeneration from that considered by Eisenbud and Harris leads to a simple and characteristic-independent proof of the Brill-Noether theorem using limit linear series. As suggested by the degeneration, we prove an extended version of the theorem allowing for imposed ramification at up to two points. Although experts in the field have long been aware of the main ideas, we address some technical issues which arise in proving the full version of theorem.

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