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 cfker_nzcharE chi :
chi \is a character -> chi != 0 -> cfker chi = [set x | chi x == chi 1%g].