Question: What are the nationalities of Leonid Khachiyan and Sofia Kovalevskaya?
Sentence (from "Sofia Kovalevskaya"): Sofia Vasilyevna Kovalevskaya (Russian: Со́фья Васи́льевна Ковале́вская ), born Sofia Vasilyevna Korvin-Krukovskaya (1850–1891), was a Russian mathematician who made noteworthy contributions to analysis, partial differential equations and mechanics.
Relevant evidence: Yes