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Russian term or phrase: вариационное исчисление и оптим. управление  Mathematics (calculus) 
  English translation:Calculus of Variations (or variational calculus) and Optimal Control  Explanation: Please note that the calculus of variations (you might use small chars if preceded with the article "the") is a rather old subject in mathematics. It is a branch of mathematics concerned with the problem of finding a function for which the value of a certain integral is either the largest or the smallest possible.
As for the optimal control, it has a large intersection with socalled control theory (field of applied mathematics that is relevant to the control of certain physical processes and systems).
Although control theory has deep connections with classical areas of mathematics, such as the calculus of variations and the theory of differential equations, it did not become a field in its own right until the late 1950s and early 1960s. Some relation between the (theory of)optimal control and socalled operations research can also be readily revealed.
Necessary words can be seen at
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I am 10+ year the editor of the English version of scientific monthly RUSSIAN MATHEMATICS (IzVUZ)(cover2cover translation of the respective journal), so you may trust into this version:)
Yours,
Dr. Tagir S. Tagirov
KSU 
 Selected response from: ttagir Local time: 02:35
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