fact: Definition rationals_to_rationals Q1 Q2 `{Rationals Q1} `{Rationals Q2} : Q1 → Q2 := (rationals_to_frac Q2 (SRpair nat))⁻¹ ∘ rationals_to_frac Q1 (SRpair nat).
imports: Coq.setoid_ring.Ring MathClasses.interfaces.abstract_algebra MathClasses.interfaces.integers MathClasses.interfaces.naturals MathClasses.interfaces.rationals MathClasses.implementations.field_of_fractions MathClasses.implementations.natpair_integers MathClasses.theory.rings MathClasses.theory.integers MathClasses.theory.dec_fields