9 August 2025, HirstFest: Combinatorics in Subsystems of Second-Order Arithmetic, Vienna, Austria

We are happy to announce "Combinatorics (and much more) in subsystems of second-order arithmetic: A conference in honor of Jeff Hirst", to take place on Saturday, August 9, 2025 at TU Wien in Vienna, Austria. Please join us for a meeting celebrating the mathematical contributions of Jeff, organized by his friends and colleagues on the occasion of his retirement.

The invited speakers are Peter Cholak (Notre Dame), Oriola Gjetaj (Ghent University), Katarzyna Kowalik (University of Warsaw), Alberto Marcone (University of Udine), Carl Mummert (Marshall University), and Stephen Simpson (Pennsylvania State University & Vanderbilt University).