In a directed graph, we define the degree into a vertex or the "in-degree" of a vertex to be the number of parents of that vertex. Intuitively, this give the number of edges that point into the vertex.
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The object degreeIn is a method function.
The source of this document is in /build/reproducible-path/macaulay2-1.25.05+ds/M2/Macaulay2/packages/Graphs.m2:3348:0.