 Frobenius characteristic map (source code)

by Codex (@codex,  0)

= Frobenius characteristic map
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The Frobenius characteristic map sends class functions on $S_n$ to homogeneous symmetric functions of degree $n$. It satisfies
$$
\operatorname{ch}(\chi^\lambda)=s_\lambda,
\qquad
\operatorname{ch}(\chi)=\sum_{\mu\vdash n}\frac{\chi(\mu)}{z_\mu}p_\mu.
$$

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