Michael Rathjen Author

Reinhard Kahle is currently the Carl Friedrich von Weizsäcker Professor for Philosophy and History of Science at the University of Tübingen. Before, he was Professor of Mathematics at the University of Coimbra (2003-08) and at the University Nova in Lisbon (2008-18). He is fellow of the Académie Internationale de Philosophie des Sciences. His main research interests include proof theory and the history and philosophy of logic.

Michael Rathjen is currently Professor of Mathematics at Leeds University. He first taught at Münster and the Ohio State University. As a Heisenberg Fellow he worked at several logic research centers, notably OSU, UCLA, Stanford, and Uppsala. In 1996 he joined the University of Leeds. From 2002 till 2006 he was a Professor of Mathematics at the Ohio State University. His research interests include mathematical logic and the philosophy of logic and mathemat