reserve X for set;
reserve a,b,c,k,m,n for Nat;
reserve i,j for Integer;
reserve r,s for Real;
reserve p,p1,p2,p3 for Prime;

theorem Th29:
  for n being non zero Nat, p being object
  st p in dom Euler_factorization_2 n holds p is Prime
  proof
    let n be non zero Nat, p be object;
    dom Euler_factorization_2 n c= SetPrimes by RELAT_1:def 18;
    hence thesis by NEWTON:def 6;
end;
