(** Converting a finite FP number to higher or equal precision preserves its value. *)

(* Specifications: *)
Theorem Bconv_widen_exact:
(prec2 >= prec1)%Z -> (emax2 >= emax1)%Z ->
forall conv_nan m f,
is_finite _ _ f = true ->
B2R _ _ (Bconv conv_nan m f) = B2R _ _ f
/\ is_finite _ _ (Bconv conv_nan m f) = true
/\ Bsign _ _ (Bconv conv_nan m f) = Bsign _ _ f.