End IrrConstt.
Arguments irr_constt {gT B%g} phi%CF.
Section Kernel.
Variable (gT : finGroupType) (G : {group gT}).
Implicit Types (phi chi xi : 'CF(G)) (H : {group gT}).

Lemma cfRes_eq0 phi : phi \is a character -> ('Res[H, G] phi == 0) = (phi == 0).
Definition Res_Iirr (A B : {set gT}) i := cfIirr ('Res[B, A] 'chi_i).