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 Th74:
  2 divides a|^(n+1) - a
  proof
    1+1 divides a|^(n*1+1) - a by INT_2:28,Th73;
    hence thesis;
  end;
