SEARCH MATHEMATICA 8 DOCUMENTATION

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Numerical Differential Equation Analysis Package Symbol

ButcherSigma

ButcherSigma[tree]
gives the order of the symmetry group of isomorphisms of tree with itself.

To use ButcherSigma, you first need to load the Numerical Differential Equation Analysis Package using Needs["NumericalDifferentialEquationAnalysis`"].