fact: Definition derive_open_interval lb ub f (pr : derivable_open_interval lb ub f) x := match in_open_interval_dec lb ub x with | left P => derive_pt_in (open_interval lb ub) f x (pr x P) | right P => 0 end.
imports: Rbase Rpower Lra Ranalysis1 Ranalysis2 Rfunctions MyRIneq Rtopology Rinterval Rfunction_facts