Усувність ізольованих сингулярностей. Лекція 3: Квазірегулярні відображення

We are considering the problem of isolated singularities for quasiregular mappings. We give a proof of the fact that, these mappings have a limit in an isolated boundary point whenever some a set of positive capacity is omitted under them. This is Martio-Rickman-Vaisala theorem from the 70-th