Welcome to my home page. I am a professor in the Department of Philosophy at Carnegie Mellon University, and (by courtesy) in the Department of Mathematical Sciences. I am the director of the Charles C. Hoskinson Center for Formal Mathematics, and I am associated with Carnegie Mellon's interdisciplinary program in Pure and Applied Logic. You can read my CV.
Mathematical logic, proof theory, philosophy of mathematics, formal verification, automated reasoning, history of mathematics.
Office: Baker Hall 135E
Department of Philosophy
Baker Hall 161
Carnegie Mellon University
Pittsburgh, PA 15213
The Hoskinson Center has been announced! You can read the press release and watch Charles Hoskinson talk about the center on YouTube. You can also watch Charles' presentation and my presentation from the inauguration of the center. The slides that went with my talk are here.
Kevin Buzzard, Johan Commelin, Yury Kudryashov, Heather Macbeth, Scott Morrison, and I are co-organizing Lean for the Curious Mathematician, which will be held at ICERM in the summer of 2022. Heather Macbeth, Patrick Massot, and I are organizing a summer school on the formalization of mathematics, which will be held at MSRI in the summer of 2023.
Marijn Heule and I are teaching a new course, Logic and Mechanized Reasoning, in the fall of 2021. You can see the course page, the textbook (still a work in progress), a PDF version of the textbook, and the course repository.
I have put online a draft of a chapter on mathematical language, written for the forthcoming Handbook for the Philosophy of Mathematical Practice.
Alexander Bentkamp and I have presented joint work in progress on verified optimization.
An essay I have written, Varieties of mathematical understanding, will appear in the Bulletin of the American Mathematical Society.
I have written a draft of a chapter on logic and foundations for the Handbook of Proof Assistants and their Applications in Mathematics and Computer Science.
Floris van Doorn and I have written a paper on a problem in decentralized control theory.
Kevin Buzzard, Robert Lewis, Patrick Massot, and I have started working on a tutorial, Mathematics in Lean. You can learn about some of the interesting things going on with Lean and mathlib on the Lean community web pages.
Good news from some of my recent and current students:
- Robert Y. Lewis joined the Department of Computer Science at Brown University.
- Floris van Doorn started a postdoctoral position in Paris.
- Mario Carneiro and Seul Baek (with Marijn Heule) have had a paper accepted to TACAS and then to a special issue of the Journal of Automated Reasoning. Wojciech Nawrocki (with Zhenjun Liu, Andreas Fröhlich, Marijn Heule and Armin Biere) has had a paper accepted at SAT.
- Mario's work on Metamath Zero is coming along (see also his YouTube tutorial).
- Seul's work on TESC, a proof format for first-order theorem provers, is coming along. His paper on a formal verifier for it was accepted at ITP.
- Paula Neeley defended her MS thesis on a formalization of dynamic epistemic logic. She gave a talk about it at Lean Together 2021.
An old paper of mine, Forcing in proof theory, has been selected as one of the winners of the Bulletin of Symbolic Logic's 25th Anniversary Prize.
I am on the editorial boards of the Journal of Automated Reasoning and Logical Methods in Computer Science.