This afternoon we will be holding a workshop for the OZSW working group “Philosophy around 1900” (already the third one). I invited Maria van der Schaar, who will give a presentation on “Frege on Judgement, Justification and the Judging Agent”, moreover Clint Verdonschot, one of the participants in my reading group on the history and foundations of phenomenology, will give a presentation on “Philosophy at the Bauhaus, 1919-1930”. I will speak on “The Metaphysics of the Mind in Christian von Ehrenfels’ Cosmogony”, based in part on my recent work on Ehrenfels, both for the SEP entry on Ehrenfels as well as my submission for the volume History of Philosophy of Mind: Philosophy of Mind in the 19th Century edited by Sandra Lapointe.

This morning I received my copy of the volume “Philosophy from an Empirical Standpoint: Essays on Carl Stumpf“, which besides many excellent analyses of Stumpfs development, position, and influences, also contains his lecture on Metaphysics (based on Husserl’s annotations in manuscript Q 10 of the Husserl-Archives Leuven) and Stumpf’s correspondence with Brentano. My own contribution to the volume predictably is on “Carl Stumpf’s Philosophy of Mathematics”. Like most of Franz Brentano’s students, also Stumpf showed an interest in the philosophy of mathematics. In particular, Stumpf wrote his habilitation thesis On the Foundations of Mathematics, used mathematical examples in central parts of his lectures, and later returned to the topic in the posthumously published Erkenntnislehre. In my contribution I show the development and continuity of Stumpf’s position from his writings and (unpublished) lectures on logic and psychology, taking into account the Brentanist approach to the philosophy of mathematics that developed in the 1880s and 1890s in the School of Brentano.