Proof search found a dead end: a situation where no further rules are applicable, but it is not possible to say anything definite about satisfiability of the problem (e.g., because of quantifiers).
Status reported if assertions and conclusions are used.
Status reported if only assertions are used.
Status of the given problem is unknown; this is usually because satisfiability/validity has not been checked yet, or because a timeout occurred.
Status reported if only assertions are used.
Status reported if assertions and conclusions are used.
(Since version ) see corresponding Javadoc for more information.