An example of a fast decaying $(p,A)$-lacunary function
Zapiski Nauchnykh Seminarov POMI, Investigations on linear operators and function theory. Part 28, Tome 270 (2000), pp. 350-363
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A function $f(z)=\sum^\infty_{k=0}a_kz^{n_k}$ analytic in the unit disc is said be $(p,A)$-lacunary if $n_k\ge Ak^p$, $1
, $A>0$ for all $k\ge0$. For $1 , $A>0$, a $(p,A)$-lacunary function $f_{1,p,A}(z)$ is constructed that decays as $x\to1-0$ almost optimally.