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János Bolyai

János Bolyai

1802 CE–1860 CE · Cluj (Klausenburg)

János Bolyai (; Hungarian: [ˈjaːnoʃ ˈboːjɒi]; 15 December 1802 – 27 January 1860) or Johann Bolyai, was a Hungarian mathematician who developed absolute geometry—a geometry that includes both Euclidean geometry and hyperbolic geometry. The discovery of a consistent alternative geometry that might correspond to the structure of the universe helped to free mathematicians to study abstract concepts irrespective of any possible connection with the physical world.

Adapted from Wikipedia, licensed under CC BY-SA 4.0.

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Cluj (Klausenburg)

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About Cluj (Klausenburg)

Cluj (German Klausenburg, Hungarian Kolozsvár), the principal city of Transylvania (today Cluj-Napoca, Romania), had a large Jewish community. Rabbi Moshe Shmuel Glasner served as its chief rabbi from 1877 to 1923, and it later gave its name to the Sanz-Klausenburg chasidic dynasty, founded there by Rabbi Yekutiel Yehuda Halberstam, a great-grandson of the Divrei Chaim of Sanz.

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