Pafnuty Lvovich Chebyshev (Russian:Пафну́тий Льво́вич Чебышёв;IPA:[pɐfˈnutʲɪj ˈlʲvovʲɪtɕ tɕɪbɨˈʂof]) (May 16[O.S. May 4]1821 – December 8[O.S. November 26]1894) was a Russian mathematician. His name can be alternatively transliterated as Chebychev, Chebysheff, Chebyshov; or Tchebychev, Tchebycheff (French transcriptions); or Tschebyschev, Tschebyschef, Tschebyscheff (German transcriptions).