in unit_set new_dpm;;
+ **Note: Simon pointed out a subtle error in this code, which we will look into fixing. At the moment, the subtle error is still there.**
+
* Representing \[[and φ ψ]] is simple:
let and_op (phi : clause) (psi : clause) : clause =
let or_op (phi : clause) (psi : clause) =
fun one_dpm -> unit_set (
fun (r, h) ->
- in let truth_value' = (
+ let truth_value' = (
truths (phi one_dpm) (r, h) <> [] ||
truths (bind_set (negate_op phi one_dpm) psi) (r, h) <> []
) in (truth_value', r, h))
let if_op (phi : clause) (psi : clause) : clause =
fun one_dpm -> unit_set (
fun (r, h) ->
- in let truth_value' = List.for_all (fun one_dpm ->
+ let truth_value' = List.for_all (fun one_dpm ->
let (truth_value, _, _) = one_dpm (r, h)
in truth_value = false || truths (psi one_dpm) (r, h) <> []
) (phi one_dpm)