We are a Working Group devoted to the discussion of historical and philosophical issues in symbolic logic, mathematics, and science. We meet on occasional Wednesday evenings for a talk and a lively discussion. The group is funded by the Doreen B. Townsend Center for the Humanities and the Department of Philosophy.

All members of the academic community are welcome to attend. We have regular participants in many different fields, including philosophy, mathematics, history of science, and psychology.

The group organizers are Lara Buchak (Philosophy), Wesley Holliday (Philosophy), John MacFarlane (Philosophy), Paolo Mancosu (Philosophy), and Seth Yalcin (Philosophy).

Our next event

October 25, 2017, 6-7:30 PM in 234 Moses Hall

Robert May (UC Davis)


What is sense? Frege’s answer is this: Sense is what makes a reference thinkable such that in virtue of thinking this way an agent has grounds for making a judgement. In this talk, I explore this conception, which places sense at the crux of Frege’s account of judgement. The central claim is that sense is a composite notion, split between what makes a reference thinkable (mode of determination) and how we think of references (mode of presentation). These are related via grasp: an agent who grasps a mode of determination of a reference has a mode of presentation of that reference, and accordingly has grounds for making a judgement. This is crucial to understanding how Frege responded to the threat to logicism posed by the identity puzzle, viz. that a = b requires a special act of recognition in judgement. But it does, perhaps surprisingly, leave open the analysis of a = a.