Reduced Divisors and Embeddings of Tropical Curves

Details Reduced Divisors and Embeddings of Tropical Curves Reduced Divisors and Embeddings of Tropical Curves

2010-07-30

arxiv.org/abs/1007.5364v2

Mathematics

Combinatorics

Final version (to appear in Trans. Amer. Math. Soc.), 29 pages, 2 figures

Scientific paper

Given a divisor $D$ on a tropical curve $\Gamma$, we show that reduced divisors define an integral affine map from the tropical curve to the complete linear system $|D|$. This is done by providing an explicit description of the behavior of reduced divisors under infinitesimal modifications of the base point. We consider the cases where the reduced-divisor map defines an embedding of the curve into the linear system, and in this way, classify all the tropical curves with a very ample canonical divisor. As an application of the reduced-divisor map, we show the existence of Weierstrass points on tropical curves of genus at least two and present a simpler proof of a theorem of Luo on rank-determining sets of points. We also discuss the classical analogue of the (tropical) reduced-divisor map: For a smooth projective curve $C$ and a divisor $D$ of non-negative rank on $C$, reduced divisors equivalent to $D$ define a morphism from $C$ to the complete linear system $|D|$, which is described in terms of Wronskians.

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