Abstract
Epistemic negation not along with default negation ¬ plays a key role in knowledge representation and nonmonotonic reasoning. However, the
existing approaches behave not satisfactorily in that
they suffer from the problems of unintended world
views due to recursion through the epistemic modal
operator K or M (KF and MF are shorthands for
¬not F and not ¬F, respectively). In this paper
we present a general approach to epistemic negation which is free of unintended world views and
thus offers a solution to the long-standing problem
of epistemic specifications which were introduced
by [Gelfond, 1991] over two decades ago