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math.CO2019★ 1 cited
Bounding the tripartite-circle crossing number of complete tripartite graphs
Charles Camacho, Silvia Fernández-Merchant, Marija Jelić Milutinović +4
A tripartite-circle drawing of a tripartite graph is a drawing in the plane, where each part of a vertex partition is placed on one of three disjoint circles, and the edges do not…
math.CO2011★ 6 cited
Injective Envelopes and Projective Covers of Quivers
Will Grilliette
This paper characterizes the injective and projective objects in the category of directed multigraphs, or quivers. Further, the injective envelope and projective cover of any quive…