DecompositionNumber(H, mu, nu)
DecompositionNumber(d, mu, nu)
This function attempts to calculate the decomposition multiplicity of
D(nu) in S(mu) (equivalently, the multiplicity of
S(mu) in P(nu)). If P(nu) is known, we just look
up the answer; if not DecompositionNumber tries to calculate the
answer using ``row and column removal'' (see [J,Theorem~6.18]).
gap> H:=Specht(6);; gap> DecompositionNumber(H,[6,4,2],[6,6]); 0
This function requires the package ``specht'' (see RequirePackage).
GAP 3.4.4