I am currently reading the paper

J. Bourgain, A. Gamburd, P. Sarnak, *Generalizations of Selberg’s theorem and affine sieve,* Acta Mathematica, **207 **(2011), 255-290

and I noticed some problems with Section 3. Namely, there are two errors. The line “taking in (3.2)” is plainly wrong; since that would yield which is not desired. Further, equation (3.3) is wrong as stated; it should be .

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