reserve r,t for Real;
reserve i for Integer;
reserve k,n for Nat;
reserve p for Polynomial of F_Real;
reserve e for Element of F_Real;
reserve L for non empty ZeroStr;
reserve z,z0,z1,z2 for Element of L;

theorem Th25:
  len <%z0,z1,z2%> <= 3
  proof
    3 is_at_least_length_of <%z0,z1,z2%> by Th24;
    hence thesis by ALGSEQ_1:def 3;
  end;
