摘要： Isaacs, $\textit{Character Theory of Finite Groups}$, Lemma(2.3) Pf: $tr(P^{-1}AP)=tr(A)$ $\mathfrak{X}(h^{-1}gh)=\mathfrak{X}(h)^{-1}\mathfrak{X}(g)\ 阅读全文