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Ralph Johnson

Virtues of defeasible argumentation subject of lecture

Philosophy professor emeritus Ralph Johnson will deliver a free public lecture entitled “Is Defeasibility a Virtue of Argumentation?” today at 2 p.m. in room 207, Essex Hall.

Dr. Johnson will begin with a brief history of the notion of defeasibility, consider some examples, and turn to discussion of the problems he sees associated with this notion and point to possible remedies.

Johnson is a senior fellow of the Centre for Research in Reasoning, Argumentation and Rhetoric, which is sponsoring this event.