Abstract
In this chapter, we study mappings acting between domains of two factor spaces by certain groups of Möbius automorphisms of the unit ball that act discontinuously and do not have fixed points. Note that the study of quotient spaces is of the utmost importance, for example, for mappings of Riemannian surfaces. In particular, by the Poincaré uniformization theorem, each such surface is homeomorphic to its quotient space; Riemannian surfaces of hyperbolic type are homeomorphic to the quotient space with respect to some group of linear fractional mappings of the unit disk onto itself, acting discontinuously and having no fixed points. For mappings acting between domains of two factor spaces, we have established estimates for the distortion of the modulus of families of paths, which are similar to the well-known Poletsky and Väisälä inequalities. As applications, we have obtained several important results on the local and boundary behavior of mappings. The chapter also contains useful and rather complex examples of such mappings.
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Sevost’yanov, E. (2023). On the Local and Boundary Behavior of Mappings of Factor Spaces. In: Mappings with Direct and Inverse Poletsky Inequalities. Developments in Mathematics, vol 78. Springer, Cham. https://doi.org/10.1007/978-3-031-45418-9_18
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