Boris Chirikov

Boris Valerianovich Chirikov (Russian: Борис Валерианович Чириков; 6 June 1928 – 12 February 2008) was a Soviet and Russian physicist. He was the founder of the physical theory of Hamiltonian chaos and made pioneering contributions to the theory of quantum chaos. In 1959, he invented the Chirikov criterion which gives an analytical estimate for the overlap of resonances and provides the conditions for transition from integrability to global chaos in Hamiltonian dynamical systems.