There are some problems in both NP and co-NP, for example all problems in P or integer factorization; however, it is not known if the sets are equal, although inequality is thought more likely.
There are some problems in both NP and co-NP. Both NP and co-NP are for example all problems in P or integer factorization. If the sets are equal, although inequality is thought more likely. This was what it is not known.