reserve a,b,c,d,m,x,n,j,k,l for Nat,
  t,u,v,z for Integer,
  f,F for FinSequence of NAT;
reserve p,q,r,s for real number;
reserve a,b,c,d,m,x,n,k,l for Nat,
  t,z for Integer,
  f,F,G for FinSequence of REAL;
reserve q,r,s for real number;
reserve D for set;

theorem
  m>0 implies ex k st ((a,b) In_Power m).1 = a*k
  proof
    m>0 implies ex k st ((a,b) In_Power (m+0)).(0+1) = a*k by Th50;
    hence thesis;
  end;
