71.23 AddIndecomposable

AddIndecomposable(d, x)

AddIndecomposable(d, x) inserts the indecomposable module x into the decomposition matrix d. If d already contains the indecomposable x then a warning is printed. The function AddIndecomposable also calculates Mullineux(x) (see Mullineux) and adds this indecomposable to d (or checks to see that it agrees with the corresponding entry of d if this indecomposable is already by d).

See IsNewIndecomposable IsNewIndecomposable for an example. See also DecompositionMatrix DecompositionMatrix and CrystalDecompositionMatrix CrystalDecompositionMatrix. This function requires the package ``specht'' (see RequirePackage).

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GAP 3.4.4
April 1997