proposition: Lemma isbinapartrafldfracop2 : isbinopapartr (afldfracapart ) op2.
proof: Proof. intros a b c. rewrite ringcomm2. rewrite ( ringcomm2 _ c ). apply isbinapartlafldfracop2. Defined.
imports: UniMath.PAdics.lemmas UniMath.Algebra.RigsAndRings UniMath.Algebra.Domains_and_Fields