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Variational problems for gauge fields. (English) Zbl 0481.58016
Semin. differential geometry, Ann. Math. Stud. 102, 455-464 (1982).

58E05 Abstract critical point theory (Morse theory, Lyusternik-Shnirel’man theory, etc.) in infinite-dimensional spaces
58E20 Harmonic maps, etc.
53C80 Applications of global differential geometry to the sciences
81T08 Constructive quantum field theory
70H25 Hamilton’s principle