Joel David Hamkins

Mathematicians do not agree on the essential structure of the complex numbers, ASL/APA Central Division Meeting, Chicago, February 2016

Introducing the elementary theory of surreal arithmetic, CUNY Logic Workshop, March 2026

The elementary theory of surreal arithmetic is bi-interpretable with set theory, Notre Dame Logic Seminar, November 2025

What is your number? Logic puzzles for mathematicians – 2025 DePrima Memorial Lecture, Caltech

The Sannomiya incident—how Jörg Brendle hit the big stage in Japanese art

The elementary theory of surreal arithmetic is bi-interpretable with set theory, Kobe, Japan, September 2025

Did Turing ever halt? HPS Colloquium, Notre Dame, October 2025

The computable surreal numbers, Fudan University, July 2025

Pointwise definable end-extensions of models of arithmetic and set theory, Changchun, China, July 2025

Lecture series on the philosophy of mathematics

How the continuum hypothesis might have been a fundamental axiom, Lanzhou China, July 2025

Potentialist conceptions of infinity, Peking University, June 2025

Lectures on Set Theory, Beijing, June 2025

Skolem’s paradox and the countable transitive submodel theorem, Leeds Set Theory Seminar, May 2025

The Church of Logic podcast, April 2025

A potentialist conception of ultrafinitism, Columbia University, April 2025

The hierarchy of consistency strengths for membership in a computably enumerable set, Oxford Logic Seminar, May 2025

Introduction to modal model theory, Panglobal Algebra and Logic Seminar, Boulder, March 2025

2025 William Reinhardt Memorial Lecture, Boulder