We investigate an aspect of defeasibility that has somewhat been overlooked by the non-
monotonic reasoning community, namely that of defeasible modes of reasoning. These aim …

Accounts of preferential reasoning in Description Logics often take as point of departure the
semantic notion of a preference order on objects in a domain of interpretation, which allows …

Modal accounts of normality in non-monotonic reasoning traditionally have an underlying
semantics based on a notion of preference amongst worlds. In this paper, we motivate and …

We venture beyond the customary semantic approach in NMR, namely that of placing
orderings on worlds (or valuations). In a modal-logic setting, we motivate and investigate the …

The success of modern artificial intelligence (AI) relies heavily on the realisation of general-
purpose autonomous systems capable of behaving rationally in a given environment. Such …

We present a precise approach to treat modalities involving vague notions. Vague notions,
such as 'generally','many','rarely','often', etc., occur often in ordinary language and in some …

In this paper, we start the study of polymodal neighbourhood languages. We provide a
completeness result for the basic polymodal neighbourhood system and show how some …