Math, Physics, Tau, et alia
Michael HartlMostly math and math learning. Posts include announcements related to Tau Day and The Tau Manifesto, as well as a variety of math topics and curated book and YouTube recommendations.
| Platform |  | Pricing | Only free issues | Publishes | Weekly |
|---|---|---|---|---|---|
| Issues | 20 | Subscribers | Read | substack.michaelhartl.com |
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Latest Issues
Recent posts by this newsletter. Browse the email archive.
Tau Day 2025
Happy 15th anniversary to tau!
The Art of Problem Solving (plus a Tau Day note)
Thanks for subscribing to Michael Hartl’s Substack (including The Tau Manifesto). I’ve just published a review of The Art of Problem Solving:
An AoPS Problem for Half Tau Day 2025
Happy Half Tau Day, everyone! Today on 3/14 we celebrate the halfway point ’round the unit circle, τ/2 = 3.14159…
How to Prove It by Daniel Velleman
Thanks for subscribing to Michael Hartl’s Substack (including The Tau Manifesto). I’ve just published a review of one of the top “intro to proofs” books, How to Prove It by Daniel Velleman:
Authors
The writers behind this newsletter.
Physicist, educator, and entrepreneur. Founder of Tau Day, author of The Tau Manifesto. Formerly of Learn Enough and the Rails Tutorial. “Hartl understands physics deeply… and like Feynman he is an outstanding pedagogue.” —Kip Thorne
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