Tatyana Afanasyeva

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Tatyana Afanasyeva

Tatyana Alexeyevna Afanasyeva (Russian: Татья́на Алексе́евна Афана́сьева) (Kiev, 19 November 1876 – Leiden, 14 April 1964) (also known as Tatiana Ehrenfest-Afanaseva) was a Russian/Dutch mathematician and physicist who made contributions to the fields of statistical mechanics and statistical thermodynamics.[1] On 21 December 1904, she married Austrian physicist Paul Ehrenfest (1880–1933). They had two daughters and two sons; one daughter, Tatyana Pavlovna Ehrenfest, also became a mathematician.

Early life[edit]

Afanasyeva was born in Kiev, Ukraine, then part of the Russian Empire. Her father was Alexander Afanassjev, a chief engineer on the Imperial Railways, who would bring Tatyana on his travels around the Russian Empire. Her father died while she was still young, so she moved to St Petersburg in Russia to live with her aunt Sonya, and uncle Peter Afanassjev, a professor at the St Petersburg Polytechnic Institute.[2]

Tatyana attended normal school in St Petersburg with a specialty in mathematics and science. At the time, women were not allowed to attend universities in Russian territory, so after graduating from normal school, Tatyana began studying mathematics and physics at the Women's University in St Petersburg under Orest Chvolson. In 1902, she transferred to University of Göttingen in Germany to continue her studies with Felix Klein and David Hilbert.[2]

At the University of Gottingen, Tatyana met Paul Ehrenfest. When Ehrenfest discovered that Tatyana could not attend a mathematics club meeting, he argued with the school to have the rule changed. A friendship developed between the two, and they married in 1904, later returned to St Petersburg in 1907. Under Russian law, marriage was not allowed between two people of different religions. Since Tatyana was a Russian Orthodox and Ehrenfest was Jewish, they both decided to officially renounce their religions in order to remain married.[1]

In 1912 they moved to Leiden in the Netherlands, where Paul Ehrenfest was appointed to succeed H.A. Lorentz as professor at the University of Leiden,[1] and where the couple lived throughout their career.

Works in Mathematics[edit]

Tatyana collaborated closely with her husband, most famously on their classic review of the statistical mechanics of Boltzmann.[2] The Conceptual Foundations of the Statistical Approach in Mechanics, by Paul and Tatyana Ehrenfest was originally published in 1911 as an article for the German Encyclopedia of Mathematical Sciences, and has since been translated and republished.

She published many papers on various topics such as randomness[3] and entropy,[4] and teaching geometry to children.[5][6]


  1. ^ van Delft, Dirk (April 2006), "Albert Einstein in Leiden" (PDF), Physics Today, vol. 59 no. 4, pp. 57–62, doi:10.1063/1.2207039 . See p. 57: "In 1912 Ehrenfest succeeded Hendrik Antoon Lorentz (1853–1928) as professor of theoretical physics at Leiden. ... In Leiden, the Ehrenfests moved into a Russian-style villa designed by Ehrenfest’s Russian wife Tatiana Afanashewa, a mathematician."
  2. ^ P. Ehrenfest & T. Ehrenfest (1911) Begriffliche Grundlagen der statistischen Auffassung in der Mechanik, in: Enzyklopädie der mathematischen Wissenschaften mit Einschluß ihrer Anwendungen. Band IV, 2. Teil ( F. Klein and C. Müller (eds.). Leipzig: Teubner, pp. 3–90. Translated as The conceptual Foundations of the Statistical Approach in Mechanics. New York: Cornell University Press, 1959. ISBN 0-486-49504-3
  3. ^ T. Ehrenfest-Afanassjewa, Die Grundlagen der Thermodynamik (Leiden 1956)
  4. ^ T. Ehrenfest-Afanassjewa, On the Use of the Notion "Probability" in Physics Am. J. Phys. 26: 388 (1958)
  5. ^ Tatjana Ehrenfest-Afanassjewa, "Exercises in Experimental Geometry. 1931" (PDF).  (214 KiB).
  6. ^ Ed de Moor Van Vormleer naar Realistische Meetkunde, Thesis, Utrecht (1999).


  • Klein, Martin J. (1972). The making of a theoretical physicist (1. ed., 2. print. ed.). Amsterdam: North-Holland Publ. ISBN 978-0720401639. 
  • Pyenson, Lewis (1995). "Ehrenfest, Tatyana Afanaseva". In McMurray, Emily J.; Kosek, Jane Kelly; Valade III, Roger M. Notable twentieth-century scientists. Detroit, MI: Gale Research. ISBN 9780810391819. 
  1. ^ a b "Tatyana Ehrenfest-Afanassyeva". www.epigenesys.eu. Retrieved 2017-05-27. 
  2. ^ a b "Ehrenfest-Afanassjewa biography". www-history.mcs.st-and.ac.uk. Retrieved 2017-05-27. 

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