Logical Validity and Alethic Pluralism: Two Problems and One Solution

According to a standard formulation, alethic pluralism holds that there are many properties of truth. The position has been challenged to make sense of the traditional definition of logical validity, understood as a necessary truth preservation. The challenge consists of two problems: one, well known, posed by mixed inferences, and another, new, related to the unity of logical validity. In this paper, I argue that a pluralist semantics for compounded sentences, put forward by Douglas Edwards, can be used to overcome both difficulties.