= Peterson–Stein formula
{wiki=Peterson–Stein_formula}
The Peterson–Stein formula is a result in the field of representation theory, particularly relating to the characters of semisimple Lie algebras. It provides a way to compute the values of certain characters of these algebras using simpler components. Specifically, the formula gives an expression for the characters of irreducible representations of a semisimple Lie algebra in terms of the characters of its subalgebras and the structure constants of the algebra.
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