Section IrrConstt.
Variable (gT : finGroupType) (G H : {group gT}).
Definition irr_constt (B : {set gT}) phi := [pred i | '[phi, 'chi_i]_B != 0].

Lemma char1_ge_constt (i : Iirr G) chi :
chi \is a character -> i \in irr_constt chi -> 'chi_i 1%g <= chi 1%g.