Section Isometries.
Variables (gT : finGroupType) (L G : {group gT}) (S : seq 'CF(L)).
Implicit Type nu : {additive 'CF(L) -> 'CF(G)}.

Lemma Zisometry_inj A nu :
{in 'Z[S, A] &, isometry nu} -> {in 'Z[S, A] &, injective nu}.