On the Jäger-Kaul theorem concerning harmonic maps
On the meromorphic potential for a harmonic surface in a k-symmetric space.
On the rank of harmonic maps.
On the singular set of stationary harmonic maps.
On the singularities of harmonic maps from a domain in into
On the topological charge conservation in the three-dimensional -model.
A field of three-component unit vectors on the dimensional spacetime is considered. Two field configurations with different values of the topological charge cannot be connected by the path of field configurations with a finite Euclidean action. Therefore there is no transition between them. The initial and final configurations are assumed to be continuous at infinity. The asymptotic behaviour of intermediate configurations may be arbitrary. The proof is based on the properties of the degree of...
On Univalent Harmonic Maps Between Surfaces.
On weakly harmonic maps and Noether harmonic maps from a Riemann surface into a Riemannian manifold