BLASCHKE’S PRODUCTS, WHOSE ZEROS APPROACH A UNIT CIRCLE BY THE TANGENT DIRECTIONS

Abstract

First, an example of S.A. Vinogradov is generalized. Then it is proved that zeros of Blaschke’s product constructed in that example can’t approach a unit circle only by tangent directions. This example suggests that statements of theorems 1 and 2 can take place at the same time.