fact: Definition inj_Q_rh := Build_RingHom _ _ inj_Q_fun inj_Q_pres_plus inj_Q_pres_mult inj_Q_pres_unit.
imports: CPoly_Degree CRing_Homomorphisms CoRN.model.ordfields.Qordfield CauchySeq Q_in_CReals CPoly_Euclid RingClass CRingClass Q_can nat_Q_lists RX_deg RX_div QX_root_loc