P = parents (D, v)
The parents of a vertex v in a digraph D are all the vertexSet u in D such that {u,v} is an edge of D. In other words, the parents of v are all the vertexSet that have edges coming out of them that point at v.
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The object parents is a method function.
The source of this document is in /build/reproducible-path/macaulay2-1.25.05+ds/M2/Macaulay2/packages/Graphs.m2:3991:0.