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edited title

edited Jan 13, 2018 at 18:35

Some questions about some examples in "sieve methods" in the book "Opera de Cribro" by Friedlander and Iwaniec

I am reading the book "Opera de Cribro - John B. Friedlander, Henryk Iwaniec" and in pages 5,6 I do not understand why and how they chose $X$, $A(x)$, $A_d(x)$, $g(p)$ and $r_d(x)$.

any hints will be appreciated.

asked Jan 13, 2018 at 14:03

asad