Wp.Filtering
Sequent Cleaning
Erase parts of a predicate that do not satisfies the condition. The erased parts are replaced by:
true
when ~polarity:false
(for hypotheses)false
when ~polarity:true
(for goals)Hence, we have:
filter ~polarity:true f p ==> p
p ==> filter ~polarity:false f p
See theory/filtering.why
for proofs.
val filter :
polarity:bool ->
(Lang.F.pred -> bool) ->
Lang.F.pred ->
Lang.F.pred
val compute : ?anti:bool -> Conditions.sequent -> Conditions.sequent