fact: Definition C_ring_morph : ring_morph (RtoC 0) (RtoC 1) Cplus Cmult Cminus Copp (@eq C) 0%Z 1%Z Z.add Z.mul Z.sub Z.opp Z.eqb (fun z => RtoC (IZR z)).
imports: Coq(Reals ssreflect) Rcomplements Rbar Continuity Derive Hierarchy