On the Gonality of Metric Graphs
Alejandro Vargas, Jan Draisma · Notices of the American Mathematical Society · 2021
The last decades have seen an extremely fruitful interplay between Riemann surfaces and graphs with a metric, inspiring the development of a standalone theory of metric graphs that has strong parallels to the theory of Riemann surfaces. This article discusses another beautiful parallel: that of maps where the geometry of the target space is as simple as possible.