fact: Definition div_rr_helper (xi yi zi : FF) := Fle2_m1 (lower xi) && Flt2_m1 (lower yi) && Fle2 (upper xi) (Fplus2 (Fplus2 (lower yi) (upper zi)) (Fmult2 (lower yi) (upper zi))) && Fle2 (Fplus2 (Fplus2 (upper yi) (lower zi)) (Fmult2 (upper yi) (lower zi))) (lower xi).
imports: Gappa_common Gappa_pred_bnd