58Exx Variational problems in infinite-dimensional spaces

• 58E05 Abstract critical point theory (Morse theory, Ljusternik-Schnirelman (Lyusternik-Shnirelman) theory, etc.)
• 58E07 Abstract bifurcation theory
• 58E09 Group-invariant bifurcation theory
• 58E10 Applications to the theory of geodesics (problems in one independent variable)
• 58E11 Critical metrics
• 58E12 Applications to minimal surfaces (problems in two independent variables)
• 58E15 Application to extremal problems in several variables; Yang-Mills functionals, See also {81T13}, etc.
• 58E17 Pareto optimality, etc., applications to economics
• 58E20 Harmonic maps
• 58E25 Applications to control theory (optimal and nonoptimal)
• 58E30 Variational principles
• 58E35 Variational inequalities (global problems)
• 58E40 Group actions
• 58E50 Applications
• 58E99 None of the above but in this section