+ let new_dpm = fun (r, h) ->
+ (* if one_dpm isn't already false at (r, h),
+ we want to check its behavior when updated with phi
+ bind_set (unit_set one_dpm) phi === phi one_dpm; do you remember why? *)
+ let (truth_value, _, _) = one_dpm (r, h)
+ in let truth_value' = truth_value && (truths (phi one_dpm) (r, h) = [])
+ (* new_dpm must return a (bool, r, h) *)
+ in (truth_value', r, h)
+ in unit_set new_dpm;;