Esther Szekeres

Esther Szekeres (; ; 20 February 191028 August 2005) was a Hungarian–Australian mathematician.

Early life and education Esther Klein was born to Ignaz Klein in a Jewish family in Budapest, Kingdom of Hungary, on 20 February 1910. As a young physics student in Budapest, and her old schoolfriend Márta Svéd (then Wachsberger), who convened over interesting mathematical problems, often at the Anonymous in Budapest City Park. Klein was known as Epsz by Svéd.

In 1933, Klein proposed to the group a combinatorial problem that Erdős named as the "Happy Ending problem", as it led to her marriage to George Szekeres. wrote the historical novel A Universe of Sufficient Size, published in 2019. It tells the story of a group of Jewish mathematicians in Hungary who flee the country, which she based on stories she had heard from Márta Svéd. While the story is fictional, several characters are loosely based on people in Svéd's circle, in particular Esther and George Szekeres, as well as Paul Erdős.