Pafnuty Lvovich Chebyshev (Russian: Пафну́тий Льво́вич Чебышёв) (May 16 [O.S. May 4] 1821 – December 8 [O.S. November 26] 1894) was a Russian mathematician. His name is transliterate variously as Chebychev, Chebyshov, Tchebycheff or Tschebyscheff (French and German transcriptions) among many others.