Russian mathematician known for contributions to analysis and in particular approximation theory (1847-1928). Autograph letter signed. no place. Oblong-8vo. 1 p. Some water stains as well as age toned. Small tear to the lower border. Red ink. Punch hole to the upper border. $ 2,721 / 2.500 € (89641)
To the Russian mathematician Konstantin Alekseevich Andreev (1848-1921): „[…] Allow me to extend, on your behalf, my deepest gratitude to the Kharkiv Mathematical Society for making me an associate. I am making use of the occasion to attest to my deepest respect and loyalty. […]“ Veniamin Kagan and D. D. Morduhai-Boltovskoi were among his students.