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 | Founded | 3 years ago | Last Issue | a year ago |
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substack.michaelhartl.comLatest Issues
Tau Day 2025
Happy 15th anniversary to tau!
When I launched the first edition of The Tau Manifesto back on June 28, 2010, I hoped that Tau Day might become a “thing”, but its success so far has exceeded my wildest expectations. With tau featured in pla...
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:
- The Art of Problem Solving
In other news, Tau Day is coming up fast! As in previous years...
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…
Tau, as you’ll likely recall, is the circle constant defined by the equation τ = C/r, a notation first publicly proposed by y...
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:
- How to Prove It by Daniel Velleman
Enjoy!...
Tau Day 2024
Read the full State of the Tau 2024 online »
It’s that time of year again: the summer (or winter!) solstice, high school graduations, college commencements, and of course Tau Day!
Michael Hartl here, founder of Tau Day and author of The T...
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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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