Author:
(1) Yitang Zhang.
Appendix A. Some Euler products
Appendix B. Some arithmetic sums
Recall that Φ2 is given by (13.9). Write
Similar to (15.3),
where
The following lemma will be proved in Appendix A.
Lemma 16.2. The function
is analytic and bounded for σ > 9/10. Further we have
The contour of integration is moved in the same way as in the proof of Lemma 8.4. Thus the right side above is, by Lemma 16.2, equal to
Hence, by (16.15),
Inserting this into (16.13) and applying Lemma 16.1 we obtain
On the other hand, by Lemma 5.8 and direct calculation,
so that
This together with (16.16) and (16.12) yields
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