Section Clifford.
Variables (gT : finGroupType) (G H : {group gT}).
Hypothesis nsHG : H <| G.
Variables (n : nat) (rG : mx_representation F G n).
Let sHG := normal_sub nsHG.
Let nHG := normal_norm nsHG.
Let rH := subg_repr rG sHG.

Lemma Clifford_iso2 x U V :
mx_iso rH U V -> x \in G -> mx_iso rH (U *m rG x) (V *m rG x).