Where fail-safe default logics fail
Paolo Liberatore · ACM Transactions on Computational Logic · 2007
Reiter's original definition of default logic allows for the application of a default that contradicts one previously applied. We call this condition failure . The possibility of generating failures has been in the past considered a semantical problem, and variants have been proposed to solve it. We show that it is instead a computational feature that is needed to encode some domains into default logic.