Abstract:
Communities consist of individuals bounds together by social relationships and roles. Within communities, individuals reason about each other's beliefs, knowledge and preferences. Knowledge, belief, preferences and even the social relationships are constantly changing, and yet our ability to keep track of these changes is an important part of what it means to belong to a community. From the perspective of individual rationality, such changes are difficult to understand, but they are not arbitrary and are governed by norms that we internalise as readily as the rules of logic. It is the logic of these internalised norms of social behaviour, a social conception of rationality, that we intend to investigate from the standpoint of logic.