2010/09/09 by Favorov, S., Golinskii, L.
#30D50 #Complex Variables (math.CV) #FOS: Mathematics
paper · doi:10.48550/arxiv.1009.1755
We obtain an upper bound for the derivative of a Blaschke product, whose zeros lie in a certain Stolz-type region. We show that the derivative belongs to the space of analytic functions in the unit disk, introduced recently in \citeFG. As an outcome, we obtain a Blaschke-type condition for critical points of such Blaschke products.