We prove a quasiconformal analogue of Koebe’s theorem related to the average Jacobian and use a normal family argument here to prove a quasiregular analogue of this result in certain domains in -dimensional space. As an application, we establish that Lipschitz-type properties are inherited by a quasiregular function from its modulo. We also prove some results of Hardy-Littlewood type for Lipschitz-type spaces in several dimensions, give the characterization of Lipschitz-type spaces for quasiregular mappings by the average Jacobian, and give a short review of the subject.
"Distortion of Quasiregular Mappings and Equivalent Norms on Lipschitz-Type Spaces." Abstr. Appl. Anal. 2014 (SI41) 1 - 20, 2014. https://doi.org/10.1155/2014/895074