= Quasisymmetric function
{wiki=Quasisymmetric_function}
Quasisymmetric functions are a class of special functions that generalize symmetric functions and are particularly important in combinatorics, representation theory, and algebraic geometry. They are defined on sequences of variables and possess a form of symmetry that is weaker than that of symmetric functions. \#\#\# Definition: A function \\( f(x_1, x_2, \\ldots, x_n) \\) is called quasisymmetric if it is symmetric in a specific way.
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