To describe simultaneous knowledge updates for di erent subgroups we propose an epistemic language with dynamic operators for actions. The language is interpreted on equivalence states (S5 states). The actions are interpreted as state transformers. Two crucial action constructors are learning and local choice. Learning is the dynamic equivalent of common knowledge. Local choice aids in constrai...

The incremental algorithm introduced in (Dale and Reiter, 1995) for producing distinguishing descriptions does not always generate a minimal description. In this paper, I show that when generalised to sets of individuals and disjunctive properties, this approach might generate unnecessarily long and ambiguous and/or epistemically redundant descriptions. I then present an alternative, constraint...

In this paper I offer a defence of a Russellian analysis of the referential uses of incomplete (mis) descriptions, in a contextual setting. With regard to descriptions (introduction), I will support the former against the latter. In 1. I explain what I mean by “essentially” incomplete descriptions: incomplete descriptions are context dependent descriptions. In 2. I examine one of the best versi...

A brief summary of each of the final projects can be found below. Please consult with your classmates to form groups of no more than 4 for each project. When you have decided on a group, please e-mail me your names. The projects will be assigned in the order in which I receive requests. A more detailed description of the questions that are to be addressed, along with a few suggestions will be p...

In order to describe a spatial environment, people must take a perspective on it. Previous researchers had claimed that in describing space, speakers take listeners on mental tours, using a consistent perspective. In contrast, we find that people use survey and mixed perspectives as well as route perspectives, and that the configuration of an environment affects perspective choice. We show that...