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automorphism
Lemma char_trans : forall H G K, K \char H -> H \char G -> K \char G. ... Lemma char_norm : forall H G, H \char G -> G \subset 'N(H). ...
2.
finfun
Lemma ffunE : forall f : aT -> rT, finfun f =1 f. Lemma fgraph_map : forall f ... Lemma ffunK : cancel (@fun_of_fin aT rT) (@finfun aT rT). Section Family. ...
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