2Ł u k as z Ko s i ń s k i Introductionr + > 0. By D we always denote the unit disc in C. For a domain D ⊂ C n , D \ {0} is denoted by D * .Following [Z2], for A = (A j k ) j =1,...,m, k=1,...,n ∈ Z m×n and b = (b 1 , ..., b m ) ∈ C m
François BertelootSergey Pinchuk