The formula that should be proved.
An LK-Proof of :- formula, or None if not successful.
Checks whether a set of clauses is unsatisfiable.
Checks whether a set of clauses is unsatisfiable.
Checks whether a formula is unsatisfiable.
Checks whether a formula is unsatisfiable.
The formula whose validity should be checked.
True if the formula is valid.
Starts an incremental proving session.
Starts an incremental proving session.