A note on algebraic rank, matroids, and metrized complexes

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Abstract

We show that the algebraic rank of divisors on certain graphs is related to the realizability problem of matroids. As a consequence, we produce a series of examples in which the algebraic rank depends on the ground field. We use the theory of metrized complexes to show that equality between the algebraic and combinatorial rank is not a sufficient condition for smoothability of divisors, thus giving a negative answer to a question posed by Caporaso, Melo, and the author.
Original languageEnglish
Pages (from-to)827 – 837
JournalMathematical Research Letters
Volume24
Issue number3
DOIs
Publication statusPublished - 1 Sept 2017

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