reserve X for set;
reserve G for Group;
reserve H for Subgroup of G;
reserve h,x,y for object;
reserve f for Endomorphism of G;
reserve phi for Automorphism of G;

theorem
  for a being Element of G
  for f being Endomorphism of G st a is_inner_wrt f
  holds f is inner Automorphism of G by Th30,Def2;
