 reserve m,n for Nat;
 reserve i,j for Integer;
 reserve S for non empty multMagma;
 reserve r,r1,r2,s,s1,s2,t for Element of S;
 reserve G for Group-like non empty multMagma;
 reserve e,h for Element of G;
 reserve G for Group;
 reserve f,g,h for Element of G;
 reserve u for UnOp of G;

theorem Th26:
  h |^ 2 = h * h
proof
  thus h |^ 2 = h |^ (1 + 1) .= h |^ 1 * h by Def7
    .= h * h by Th25;
end;
