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).
GAP 3.4.4