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WeylGroups :: rootSystem(RootSystem,Parabolic)

rootSystem(RootSystem,Parabolic) -- the root system of the Levy subgroup of a parabolic

Synopsis

Description

i1 : R1=rootSystemD(4)

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

o1 : RootSystem
i2 : P=parabolic(R1,set{1,3,4})

o2 = set {1, 3, 4}

o2 : Parabolic
i3 : R2=rootSystem(R1,P)

o3 = RootSystem{...8...}

o3 : RootSystem
i4 : dynkinType(R2)

o4 = DynkinType{{A, 1}, {A, 1}, {A, 1}}

o4 : DynkinType