Motivated by the way numerical semigroups arise from primitive digraphs, we initiate the study of the graphic structure of a numerical semigroup. We lay some general groundwork for determining this structure and apply our results to a minimization problem.
"The graphic structure of a numerical semigroup." Rocky Mountain J. Math. 49 (6) 1811 - 1828, 2019. https://doi.org/10.1216/RMJ-2019-49-6-1811