49Jxx
From MSCWiki
49Jxx Existence theories {Info & Stats}
 49J05 Free problems in one independent variable
 49J10 Free problems in two or more independent variables
 49J15 Optimal control problems involving ordinary differential equations
 49J20 Optimal control problems involving partial differential equations
 49J21 Optimal control problems involving relations other than differential equations

49J22 Optimal control problems involving integral equations 
49J24 Optimal control problems involving differential inclusions [See also 34A60] 
49J25 Optimal control problems involving equations with retarded arguments [See also 34K35]  49J27 Problems in abstract spaces [See also 90C48, 93C25]
 49J30 Optimal solutions belonging to restricted classes (Lipschitz controls, bangbang controls, etc.)
 49J35 Minimax problems
 49J40 Variational methods including variational inequalities [See also 47J20]
 49J45 Methods involving semicontinuity and convergence; relaxation
 49J50 Fréchet and Gateaux differentiability [See also 46G05, 58C20]
 49J52 Nonsmooth analysis [See also 46G05, 58C50, 90C56]
 49J53 Setvalued and variational analysis [See also 28B20, 47H04, 54C60, 58C06]
 49J55 Problems involving randomness [See also 93E20]
 49J99 None of the above, but in this section