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[lambda.git]
/
hints
/
assignment_7_hint_6.mdwn
diff --git
a/hints/assignment_7_hint_6.mdwn
b/hints/assignment_7_hint_6.mdwn
index
d69c92e
..
38f6c2e
100644
(file)
--- a/
hints/assignment_7_hint_6.mdwn
+++ b/
hints/assignment_7_hint_6.mdwn
@@
-27,6
+27,8
@@
in unit_set new_dpm;;
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 =
* Representing \[[and φ ψ]] is simple:
let and_op (phi : clause) (psi : clause) : clause =
@@
-39,7
+41,7
@@
let or_op (phi : clause) (psi : clause) =
fun one_dpm -> unit_set (
fun (r, h) ->
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))
truths (phi one_dpm) (r, h) <> [] ||
truths (bind_set (negate_op phi one_dpm) psi) (r, h) <> []
) in (truth_value', r, h))
@@
-47,7
+49,7
@@
let if_op (phi : clause) (psi : clause) : clause =
fun one_dpm -> unit_set (
fun (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)
let (truth_value, _, _) = one_dpm (r, h)
in truth_value = false || truths (psi one_dpm) (r, h) <> []
) (phi one_dpm)