Question: Nikolai Chebotaryov and Dmitri Egorov, have which occupation?
Sentence (from "Dmitri Egorov"): Dmitri Fyodorovich Egorov (Russian: Дми́трий Фёдорович Его́ров ; December 22, 1869 – September 10, 1931) was a Russian and Soviet mathematician known for significant contributions to the areas of differential geometry and mathematical analysis.
Relevant evidence: Yes