Greek mathematics is the mathematics written by Greek mathematicians, developed from the 7th century BC to the 4th century AD around the shores of the Eastern Mediterranean.
 Greek mathematicians lived in cities spread over the entire Eastern Mediterranean from Italy to North Africa but were united by culture and language.
 Greek mathematics of the period following Alexander the Great is sometimes called Hellenistic mathematics.
 The word "mathematics" itself derives from the ancient Greek "μάθημα" ("mathema"), meaning "subject of instruction".
 The study of mathematics for its own sake and the use of generalized mathematical theories and proofs is the key difference between Greek mathematics and those of preceding civilizations.
Grand Duchess Xenia Alexandrovna of Russia (Russian: Ксения Александровна Романова ; 6 April [O.S. 25 March] 1875 – 20 April 1960) was the elder daughter and fourth child of Emperor Alexander III of Russia and Empress Maria Feodorovna of Russia (née Princess Dagmar of Denmark) and the sister of Emperor Nicholas II.
 She married a cousin, Grand Duke Alexander Mikhailovich of Russia, with whom she had seven children.
 She was the mother-in-law of Felix Yusupov and a cousin of Grand Duke Dmitri Pavlovich of Russia who, together, killed Grigori Rasputin, holy healer to her nephew, the haemophiliac Tsarevich Alexei Nikolaevich of Russia.
 During her brother's reign she recorded in her diary and letters increasing concern about his rule.
 After the fall of the monarchy in February 1917 she fled Russia, eventually settling in the United Kingdom.
Mathematicians born in the 19th century listed by nationality.
Harvey Mudd College (HMC) is a private residential liberal arts college of science, engineering and mathematics, founded in 1955 and located in Claremont, California, United States.
 It is one of the institutions of the contiguous Claremont Colleges, which share adjoining campus grounds.
 The college's mission is "to educate engineers, scientists, and mathematicians well versed in all of these areas and in the humanities and the social sciences so that they may assume leadership in their fields with a clear understanding of the impact of their work on society".
In mathematics, the soul theorem is a theorem of Riemannian geometry that largely reduces the study of complete manifolds of non-negative sectional curvature to that of the compact case.
 Cheeger and Gromoll proved the theorem in 1972 by generalizing a 1969 result of Gromoll and Wolfgang Meyer.
 The related soul conjecture was formulated by Gromoll and Cheeger in 1972 and proved by Grigori Perelman in 1994 with an astonishingly concise proof.
Steven Rudich (born October 4, 1961) is a professor in the Carnegie Mellon School of Computer Science.
 In 1994, he and Alexander Razborov proved that a large class of combinatorial arguments, dubbed natural proofs were unlikely to answer many of the important problems in computational complexity theory.
 For this work, they were awarded the Gödel prize in 2007.
 He also co-authored a paper demonstrating that all currently known NP-complete problems remain NP-complete even under AC or NC reductions.
"Manifold Destiny" is an article in "The New Yorker" written by Sylvia Nasar and David Gruber and published in the August 28, 2006 issue of the magazine.
 It claims to give a detailed account (including interviews with many mathematicians) of some of the circumstances surrounding the proof of the Poincaré conjecture, one of the most important accomplishments of 20th and 21st century mathematics, and traces the attempts by three teams of mathematicians to verify the proof given by Grigori Perelman.
Georg Aumann (November 11, 1906, Munich, Germany – August 4, 1980), was a German mathematician.
 He was known for his work in general topology and regulated functions.
 During World War II, he worked as part of a group of five mathematicians, recruited by Wilhelm Fenner, and which included Ernst Witt, Georg Aumann, Alexander Aigner, Oswald Teichmueller and Johann Friedrich Schultze, and lead by Wolfgang Franz, to form the backbone of the new mathematical mathematical research department in the late 1930's, which would eventually be called: Section IVc of Cipher Department of the High Command of the Wehrmacht (abbr.
 OKW/Chi).
 He also worked as a cryptanalyst, on the initial breaking of the most difficult cyphers.
 He was also involved in the development of cryptanalytic theory.
Aleksandr Aleksandrovich Razborov (Russian: Алекса́ндр Алекса́ндрович Разбо́ров ; born February 16, 1963), sometimes known as Sasha Razborov, is a Soviet and Russian mathematician and computational theorist.
Grigori Yakovlevich Perelman (Russian: Григо́рий Я́ковлевич Перельма́н ; ] ; born 13 June 1966) is a Russian mathematician.
 He made a contribution to Riemannian geometry and geometric topology.

Question: Do mathematicians Grigori Perelman and Alexander Razborov share the same nationality?
Answer: yes