Multiple Roles and Deontic Logic

Abstract

This paper aims to introduce the concept of role to characterize the tolerance for normative conflicts. It starts by presenting a kind of syllogism, which we call the role-related deontic syllogism. Then, we propose a deontic logic of multiple roles based on the role-related deontic syllogism. The significant characteristic of this logic is tolerating normative conflicts. A sound and complete deductive system for this logic is presented, and the decidability of this logic is proved. In addition, based on this logic, we discuss two different modes of collective obligation.