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answered 2022-01-03 14:22:48 +0100
Like this
sage: W = WeylCharacterRing(['A', 1]) sage: L4 = W([4]) sage: L4.weight_multiplicities() {(4, 0): 1, (3, 1): 1, (2, 2): 1, (1, 3): 1, (0, 4): 1}