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WeylGroups :: endVertices(DynkinDiagram)

endVertices(DynkinDiagram) -- the vertices of a Dynkin diagram with at most one neighbor

Synopsis

Description

i1 : R=rootSystemE(6)

o1 = RootSystem{...8...}

o1 : RootSystem
i2 : D=dynkinDiagram(R)

o2 = DynkinDiagram{{{3}, {}, {}, {}, {}}, {{4}, {}, {}, {}, {}}, {{1, 4}, {}, {}, {}, {}}, {{2, 3, 5}, {}, {}, {}, {}}, {{4, 6}, {}, {}, {}, {}}, {{5}, {}, {}, {}, {}}}

o2 : DynkinDiagram
i3 : endVertices(D)

o3 = set {1, 2, 6}

o3 : Set