Joel David Hamkins is the O’Hara Professor of Philosophy and Mathematics at the University of Notre Dame, where he recently moved from the University of Oxford. Joel is one of the leading set theorists and philosophers of mathematics in the world, and he and Robinson discuss a lot—Hilbert’s Hotel, the continuum hypothesis, the set-theoretic multiverse, and even Joel’s dapper hat collection—but the main subject is his upcoming book, The Book of the Infinite, which is an accessible text on paradoxes and infinity. Joel has made the novel move of serializing it on Substack, so you can participate in its creation by checking out the link below, and otherwise see what he’s thinking about and working on through Twitter, MathOverflow, and his blog. The conversation grows technical from Substack: https://joeldavidhamkins.substack.comTwitter: https://twitter.com/JDHamkinsMathOverflow: https://mathoverflow.net/users/1946/joel-david-hamkinsJoel’s Blog: http://jdh.hamkins.orgOUTLINE: Linktree: https://linktr.ee/robinsonerhardt Twitter: https://twitter.com/robinsonerhardt Instagram: https://www.instagram.com/robinsonerhardt/ Twitch (Robinson Eats): https://www.twitch.tv/robinsonerhardt YouTube (Robinson Eats): youtube.com/@robinsoneats TikTok: https://www.tiktok.com/@robinsonerhardt