## Mathematics Subject Classification – MSC2020

History of calculus of variations and optimal control [Consider also classification numbers from Section 01-XX] 226

Mean field games and control {For partial differential equations, see 35Q89; for game theory, see 91A16} 61

Variational methods for eigenvalues of operators [Should also be assigned at least one other classification number in Section 49-XX] [See also 47A75] 1359

Variational methods for eigenvalues of operators [Should also be assigned at least one other classification number in Section 49-XX] [See also 47A75] 385

Variational principles of physics [Should also be assigned at least one other classification number in Section 49-XX] 3547

Variational principles of physics [Should also be assigned at least one other classification number in Section 49-XX] 3533