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**Tadashi Tokieda** (Japanese: 時枝正; born 1968) is a Japanese mathematician, working in mathematics and physics. He is a professor of mathematics at Stanford University; previously he was a fellow and Director of Studies of Mathematics at Trinity Hall, Cambridge. He is also very active in inventing, collecting, and studying toys that uniquely reveal and explore real-world surprises of mathematics and physics. In comparison with most mathematicians, he had an unusual path in life: he started as a painter, and then became a classical philologist, before switching to mathematics. Tokieda is known for his outstanding public lectures where he shows mathematical phenomena and teaches how to use mathematical concepts in a simple, entertaining and beautiful way.

Tadashi Tokieda | |
---|---|

Born | 1968 (age 55–56) Tokyo, Japan |

Education | Sophia University^{[2]}University of Oxford Princeton University |

Awards | Paul R. Halmos–Lester R. Ford Award (2014)^{[1]} |

Scientific career | |

Fields | Mathematics |

Institutions | Princeton University Cambridge University Stanford University |

Thesis | Null Sets of Symplectic Capacity |

Doctoral advisor | William Browder |

Tokieda was born in Tokyo and initially intended to be a painter.^{[3]} He then studied at Lycée Sainte-Marie Grand Lebrun^{[2]} in France as a classical philologist. According to his personal homepage, he taught himself basic mathematics from Russian collections of problems.

He is a 1989 classics graduate from Sophia University^{[2]} in Tokyo and has a 1991 bachelor's degree from Oxford in mathematics (where he studied as a British Council Fellow). He obtained his PhD at Princeton in 1996 under the supervision of William Browder.^{[4]}

Tokieda joined the University of Illinois at Urbana Champaign as a J. L. Doob Research Assistant Professor for the 1997 academic year.^{[5]}

He has been involved in the African Institute for Mathematical Sciences since its beginning in 2003.

In 2004, he was elected a Fellow of Trinity Hall, where he became the Director of Studies in Mathematics and the Stephan and Thomas Körner Fellow.^{[6]}^{[7]}

He was the William and Flora Hewlett Foundation Fellow in 2013–2014 at the Radcliffe Institute for Advanced Study at Harvard University.^{[8]}

In the academic year 2015–2016 he was the Poincaré Distinguished Visiting Professor at Stanford.^{[9]}

Besides his native language Japanese, he is also fluent in French and English. In addition, he knows ancient Greek, Latin, classical Chinese, Finnish, Spanish, Russian as well as countless others.^{[10]} When asked how many languages he knows, he answered "I don't really know. It's like asking how many friends you have."^{[11]} So far he has lived in eight countries.^{[12]}

In March 2020, Tokieda was interviewed on *The Joy of X*, Steven Strogatz's podcast for *Quanta Magazine*.^{[13]}

- Tokieda, Tadashi (2013). "Roll Models".
*The American Mathematical Monthly*.**120**(3): 265–282. doi:10.4169/amer.math.monthly.120.03.265. S2CID 38892886. - Childress, Stephen; Spagnolie, Saverio E.; Tokieda, Tadashi (2011). "A bug on a raft: recoil locomotion in a viscous fluid".
*Journal of Fluid Mechanics*.**669**: 527–556. Bibcode:2011JFM...669..527C. doi:10.1017/S002211201000515X. S2CID 14039767. - Montaldi, James; Tokieda, Tadashi (2003). "Openness of momentum maps and persistence of extremal relative equilibria".
*Topology*.**42**(4): 833–844. arXiv:math/0201282. doi:10.1016/S0040-9383(02)00047-2. S2CID 8814996. - Aref, Hassan; Newton, Paul K.; Stremler, Mark A.; Tokieda, Tadashi; Vainchtein, Dmitri L. (2003). "Vortex Crystals".
*Advances in Applied Mechanics*.**39**: 1–79. doi:10.1016/s0065-2156(02)39001-x. ISBN 9780120020393. - Tokieda, Tadashi (2001). "Tourbillons dansants" [Dancing Swirls].
*Comptes Rendus de l'Académie des Sciences, Série I*.**333**(10): 943–946. doi:10.1016/S0764-4442(01)02162-0. - Tokieda, Tadashi (1998). "Mechanical Ideas in Geometry".
*The American Mathematical Monthly*.**105**(8): 697–703. doi:10.2307/2588986. JSTOR 2588986.

**^**"Paul R. Halmos - Lester R. Ford Awards".*Maa.org*.- ^
^{a}^{b}^{c}*数学まなびはじめ 第３集*[*Introduction to Mathematics Learning Volume 3*] (in Japanese). Tōkyō: Nihon Hyōronsha. 23 July 2015. pp. 190–203. ISBN 978-4-535-78592-2. **^**Tokieda, Tadashi (July 11, 2022). "An Educated Adult".*Numberphile*(Interview). Interviewed by Brady Haran. California. Retrieved July 11, 2022.**^**"Tadashi Tokieda - The Mathematics Genealogy Project".*University of North Dakota*.**^**"Math Times - Fall 1997" (PDF).*Illinois.edu*.**^**"homepage".*Trinity Hall, Cambridge*. Archived from the original on 2016-06-05.**^**"Tadashi Tokieda's bio".*Cam.ac.uk*.**^**"Tadashi Tokieda".*Harvard.edu*. 25 September 2013.**^**"homepage".*Stanford.edu*.**^**"bio".*"Modern Mathematics" International summer school for students*.**^**Herzberg, Nathaniel (9 June 2023). "直感の逆を突き、驚かせ、人の未知への欲求を刺激する 仏紙が唸る「数学を世間に広める能力で、時枝正にかなう者はいない」" [He goes against intuition, surprises people, and stimulates their desire for the unknown. A French newspaper raves: "No one can match Tokieda Tadashi in his ability to popularize mathematics to the public."].*Courrier Japon*(in Japanese). Retrieved October 21, 2024.時枝はいったい何ヵ国語に通じているのだろうか。 「それは妻にしか打ち明けていない秘密というか、本当のところを言えば、よくわからないんです。言ってみれば、友達が何人いるのかを問われるようなものです。そんな質問は普通しませんよね」

[Just how many languages does Tokieda know? "It's a secret I only tell my wife, and to be honest, I don't really know. It's like asking how many friends you have. No one normally asks that question."]**^**Stony Brook University (27 October 2016). "Five Questions With Tadashi Tokieda" – via YouTube.**^**"Tadashi Tokieda's Special Kind of Magic". Quanta Magazine. 10 March 2020. Retrieved 11 March 2020.

Wikiquote has quotations related to **Tadashi Tokieda**.

- Tadashi Tokieda at the Mathematics Genealogy Project
- Personal Homepage at the Wayback Machine (archived September 19, 2018) at the University of Cambridge
- "Toy inspires new spin on Earth's magnetic field",
*New Scientist* - "Tadashi Tokieda on Numberphile playlist- YouTube".
*YouTube*.