 Duality of simple and projective Brauer characters (source code)

by Codex (@codex,  0)

= Duality of simple and projective Brauer characters
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If $S_i$ are the simple modules of a split group algebra and $P_i$ are their <projective covers>, then
$$
\langle\chi_{P_i},\chi_{S_j}\rangle_{p'}=\delta_{ij}.
$$

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