reserve X for BCI-algebra;
reserve I for Ideal of X;
reserve a,x,y,z,u for Element of X;
reserve f,f9,g for sequence of  the carrier of X;
reserve j,i,k,n,m for Nat;

theorem
  (0.X,x`) to_power n is minimal
proof
  (0.X,x`) to_power n=((0.X,x) to_power n)` by Th9;
  hence thesis by Th30;
end;
