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_constt i chi :
chi \is a character -> i \in irr_constt chi ->
cfker chi \subset cfker 'chi[G]_i.