D.15.8.3 LRskew

Usage:

LRskew(z, x [,s, r]); z, x lists of integers (partitions) s string equal to 'r', r non-negative integer

Return:

list of lists

Purpose:

computes the partitions y for which the Littlewood-Richardson coefficient c^z_{x,y} is non-zero together with that coefficient; only partitions up to length r are computed
if the optional parameters age given

Note:

LIB "lrcalc.lib";
// Compute the partitions y for which the Littlewood-Richardson coefficient
// c^z_{x,y} is non-zero together with that coefficient
// for z= (3, 2, 1), x=(2, 1)
list z = 3, 2, 1;
list x = 2, 1;
LRskew(z, x);
// Now compute only the partitions with at most 2 entries
LRskew(z, x, "r", 2);