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;

theorem Th64:
  for a,b be odd Nat holds 4 divides a - b implies 4 divides a|^n-b|^n
  proof
    let a,b be odd Nat;
    assume
    A1: 4 divides a - b;
    a-b divides a|^n - b|^n by NEWTON01:33;
    hence thesis by A1,INT_2:9;
  end;
