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Restrictions on harmonic maps of surfaces. (English) Zbl 0328.58008

MSC:
58E15 Variational problems concerning extremal problems in several variables; Yang-Mills functionals
31C05 Harmonic, subharmonic, superharmonic functions on other spaces
31C99 Generalizations of potential theory
35J60 Nonlinear elliptic equations
49Q99 Manifolds and measure-geometric topics
53C20 Global Riemannian geometry, including pinching
55M25 Degree, winding number
58D15 Manifolds of mappings
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