What Greek mathematician who spend most of his professional life in Germany lends his name to the Vitali–Carathéodory theorem?
Vitali–Carathéodory theorem In mathematics, the Vitali–Carathéodory theorem is a result in real analysis that shows that, under the conditions stated below, integrable functions can be approximated in L from above and below by lower- and upper-semicontinuous functions, respectively. It is named after Giuseppe Vitali and Constantin Carathéodory.
G. V. Belyi Gennadii Vladimirovich Belyi (1951–2001, Ukrainian: Генадій Володимирович Білий , Russian: Геннадий Владимирович Белый ) was a Soviet, Ukrainian, and Russian mathematician, known for Belyi's theorem on the representation of algebraic curves as Riemann surfaces and for the Belyi functions arising in that theorem.