Who died first, Dmitri Anosov or Jakow Trachtenberg?
Jakow Trachtenberg
Title: Dmitri Anosov
Passage: Dmitri Victorovich Anosov (Russian: Дми́трий Ви́кторович Ано́сов ; November 30, 1936 – August 5, 2014) was a Soviet and Russian mathematician, known for his contributions to dynamical systems theory.
Title: Jakow Trachtenberg
Passage: Jakow Trachtenberg (17 June 1888 – 1953) was a Jewish mathematician who developed the mental calculation techniques called the Trachtenberg system.
Title: Trachtenberg system
Passage: The Trachtenberg system is a system of rapid mental calculation.  The system consists of a number of readily memorized operations that allow one to perform arithmetic computations very quickly.  It was developed by the Russian Jewish engineer Jakow Trachtenberg in order to keep his mind occupied while being held in a Nazi concentration camp.
Dmitri Anosov Jakow Trachtenberg