Question: Pyotr Novikov and Sofia Kovalevskaya had what career in common?
Context: Olga Kharlampovich is a Russian-Canadian mathematician working in the area of group theory.  She is a professor at the CUNY Graduate Center and Hunter College.  Prior to this she was a Professor of Mathematics at McGill University, Montreal, Canada, where she has been working since 1990.  She is mostly known for her example of a finitely presented 3-step solvable group with unsolvable word problem (solution of the Novikov–Adian problem) and for the solution together with A. Myasnikov of the Tarski conjecture (from 1945) about equivalence of first order theories of finitely generated non-abelian free groups (also solved by Zlil Sela) and decidability of this common theory. Pyotr Sergeyevich Novikov (Russian: Пётр Серге́евич Но́виков ; 15 August 1901, Moscow, Russian Empire – 9 January 1975, Moscow, Soviet Union) was a Soviet mathematician. Olga Holtz (Russian: Ольга Гольц ; born August 19, 1973) is a Russian mathematician specializing in numerical analysis.  She received the Sofia Kovalevskaya Award in 2006 and the European Mathematical Society Prize (2008).  Since 2008, she is a member of the Young Academy (Junge Akademie"") of Germany. The Alexander von Humboldt Foundation of Germany bestows the Sofia Kovalevskaya Award every two years.  Sofia Kovalevskaya (1850–1891) was the first major Russian female mathematician, who made important contributions to mathematical analysis, differential equations and mechanics, and the first woman appointed to a full professorship in Northern Europe.  This prestigious award named in her honor is given to promising young academics to pursue their line of research in the sciences or arts and humanities.  The foundation encourages applications from all areas of the academy so long as the investigator received a Ph.D. in the last six years and may be categorized as "top flight" by their publications and experience as commensurate with age. Tricia Striano was born in Weymouth Massachusetts.  She obtained her BA in psychology from The College of the Holy Cross.  She obtained her Ph.D. in Psychology from Emory University in 2000, after which she became Head of the Independent Research Group on Cultural Ontogeny at the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany.  In 2004, Tricia Striano received the Sofia Kovalevskaya Award  of the Alexander von Humboldt Foundation.  She used the award to build the Neurocognition and Development Group at the Max Planck Institute for Human Cognitive and Brain Sciences and Center for Advanced Studies at the University of Leipzig.  In 2008, Dr. Striano obtained her habilitation from the University of Osnabruck in Germany.  Dr. Striano is currently a Professor in the Department of Psychology at Hunter College, City University of New York. Pyotr Georgyevich Novikov (Russian: Пётр Георгиевич Новиков ; 18 December 1907 – August 1944) was a Red Army major general.  Novikov fought in the Spanish Civil War as a battalion commander.  After returning to the Soviet Union he fought in the Winter War.  After the end of the Winter War Novikov became commander of the 2nd Cavalry Division.  He led the division in battles on the Southern Front.  The division became the 109th Rifle Division and fought in the Siege of Sevastopol.  After the evacuation of Filipp Oktyabrsky and Ivan Yefimovich Petrov, Novikov became commander of the Sevastopol defense.  Novikov attempted to evacuate the city on a patrol boat and was intercepted and captured by German forces.  He was sent to concentration camps in Germany and died at Flossenbürg concentration camp in August 1944. Novikov, Novikoff (masculine) or Novikova (feminine) is one of the most common Russian surnames.  Derived from "novik" - a teenager on military service who comes from a noble, boyar or cossack family in Russia of 16th-18th centuries.  It may refer to: Anne Jaclard, born Anna Vasilyevna Korvin-Krukovskaya (1843–1887), was a Russian socialist and feminist revolutionary.  She participated in the Paris Commune and the First International and was a friend of Karl Marx.  She was once engaged to Fyodor Dostoyevsky but married the Blanquist Victor Jaclard.  Her sister was the mathematician and socialist Sofia Kovalevskaya (1850–1891). Pyotr Kirichek (Russian: Пётр Тихонович Киричек ; 1902 — 1968) was a Soviet singer, a bass-baritone.  After graduating from the Moscow Conservatory, he worked as a soloist at the Bolshoi Theater (1934–1944) and then mostly toured with programs devoted to romances and contemporary Soviet songs.  He was awarded the title of Meritorious Artist of the RSFSR in 1960.  Kirichek performed or recorded such songs as "March of the Soviet Tankmen" ("Марш советских танкистов"), "Anthem of the International Union of Students" ("Гимн международного союза студентов"), "Goodbye, Rocky Mountains" ("Прощайте, скалистые горы").  Composer Anatoly Novikov praised him as a real tribune and a real fighter who didn't care about the conditions under which he had to sing, who performed in factories, at field camps and on ships and gave about 1,500 concerts on the front line during the Great Patriotic War. 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.  She was the first major Russian female mathematician and a pioneer for women in mathematics around the world.  She was the first woman appointed to a full professorship in Northern Europe and was also one of the first women to work for a scientific journal as an editor.  Her sister was the socialist Anne Jaclard.
Answer: mathematician