Michael Hartl
Michael Hartl | |
|---|---|
| Born | United States |
| Nationality | American |
| Occupation(s) | Mathematician, programmer, writer |
| Academic background | |
| Education | California Institute of Technology |
| Thesis | Dynamics of Spinning Compact Binaries in General Relativity (2003) |
| Academic work | |
| Main interests | Black hole dynamics Tau Computational physics Programming languages |
| Notable works | The Tau Manifesto |
| Website | www |
Michael Hartl is an American mathematician, physicist, and computer programmer who is known for his proposal to replace pi (π) with tau (2π).[1][2]
Education[edit]
In the 1990s, Hartl attended Harvard University for his undergraduate studies, graduating with a bachelor's degree in physics. Hartl obtained his doctorate from the California Institute of Technology in 2003, where he researched black hole dynamics. His dissertation was titled Dynamics of Spinning Compact Binaries in General Relativity.[3]
Career[edit]
In 2010, Hartl published The Tau Manifesto. In the book, he proposed to use the Greek letter tau to represent the circle constant: τ = 2π.[4] A revised edition was published in 2019.[5]
Hartl is also a proponent of Tau Day, celebrated on June 28.[6]
Selected publications[edit]
Scientific articles[edit]
- Hartl, Michael D. (2003). "Lyapunov exponents in constrained and unconstrained ordinary differential equations". Phys. Rev. E. doi:10.48550/ARXIV.PHYSICS/0303077.
- Hartl, Michael D. (2003). "Dynamics of spinning test particles in Kerr spacetime". Physical Review D. 67 (2). doi:10.1103/PhysRevD.67.024005. ISSN 0556-2821.
- Hartl, Michael D. (2003). "Survey of spinning test particle orbits in Kerr spacetime". Physical Review D. 67 (10). doi:10.1103/PhysRevD.67.104023. ISSN 0556-2821.
- Hartl, Michael; Buonanno, Alessandra (2005). "Dynamics of precessing binary black holes using the post-Newtonian approximation". Physical Review D. 71 (2). doi:10.1103/PhysRevD.71.024027. ISSN 1550-7998.
Books[edit]
- Hartl, Michael (2022). Ruby on Rails Tutorial. Boston Columbus New York San Francisco Amsterdam Cape Town Dubai London Madrid Milan Munich Paris Montreal Toronto Delhi Mexico City Sao Paulo Sydney Hong Kong Seoul Sinapore Taipei Tokyo: Addison-Wesley Professional Ruby Series. ISBN 978-0-13-804984-3.
- Hartl, Michael (2022). Learn Enough Developer Tools to Be Dangerous. Addison-Wesley Professional. ISBN 978-0-13-784345-9.
- Hartl, Michael (2022). Learn Enough JavaScript to Be Dangerous. Addison-Wesley Professional. ISBN 978-0-13-784374-9.
- Hartl, Michael (2023). Learn Enough Python to Be Dangerous. Boston: Addison-Wesley Professional. ISBN 978-0-13-805095-5.
References[edit]
- ^ Aron, Jacob (2011). "Michael Hartl: It's time to kill off pi". New Scientist. 209 (2794): 23. doi:10.1016/S0262-4079(11)60036-5.
- ^ Bartholomew, Randyn Charles (2014-06-25). "Why Tau Trumps Pi". Scientific American. Retrieved 2024-06-08.
- ^ Hartl, Michael (2003). Dynamics of Spinning Compact Binaries in General Relativity (PhD thesis). Pasadena, California: California Institute of Technology. Retrieved 2024-06-08.
- ^ Hartl, Michael (2010-03-14). "The Tau Manifesto" (PDF). Archived (PDF) from the original on 2019-07-18. Retrieved 2019-08-05.
- ^ Hartl, Michael (2019-03-14) [2010-03-14]. "The Tau Manifesto". Archived from the original on 2019-06-28. Retrieved 2013-09-14.
- ^ "In case Pi Day wasn't enough, it's now 'Tau Day' on the Internet". www.cnn.com. Retrieved 2024-06-08.
