reserve R for Ring, S for R-monomorphic Ring,
        K for Field, F for K-monomorphic Field,
        T for K-monomorphic comRing;

theorem Th14:
   for f being Monomorphism of K,F st K,F are_disjoint
   holds F, embField f are_isomorphic
   proof
     let f be Monomorphism of K,F;
     assume AS: K,F are_disjoint;
     set g = emb_iso f;
     g is unity-preserving additive multiplicative by AS,Th11,Th12;
     then g is isomorphism by AS,Th13,MOD_4:def 12;
     hence thesis by QUOFIELD:def 23;
   end;
