 reserve G for Group;
 reserve H for Subgroup of G;
 reserve a, b, c, x, y for Element of G;
 reserve h for Homomorphism of G, G;
 reserve q, q1 for set;

theorem Th13:
  InnAut G c= Aut G
  proof
    let q be object;
    assume q in InnAut G;
    then consider f be Element of InnAut G such that
A1: f = q;
    f is Element of Aut G by Th12;
    hence q in Aut G by A1;
  end;
