Evgeny Viktorovskyy (1926-1956) became a prominent follower of the school of mathematics M.P. Kravchuk. Six of his works and PhD thesis were a breakthrough in the theory of differential equations with discontinuous operator. After defending his doctoral specialized scientific council recognized the thesis worthy of the degree of Doctor of Physical and Mathematical Sciences - time in the history CPI unique. He is founder of the theory of optimal control. This theory has gained most of our time and decides latest technological issue. It surely can be called science of the XXI century.