(** Change of format (to higher precision) and conversion to integer. *)

Theorem ZofB_range_Bconv:
forall min1 max1 min2 max2,
prec2 >= prec1 -> emax2 >= emax1 -> min2 <= min1 -> max1 <= max2 ->
forall conv_nan m f n,
ZofB_range _ _ f min1 max1 = Some n ->
ZofB_range _ _ (Bconv conv_nan m f) min2 max2 = Some n.