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Could anyone explain to me how A and B are the same/different/equivalent?

A = The Siegel-Walfisz Theorem as stated in Wikipedia (this is the statement in Davenport)

B = The Siegel-Walfisz Theorem with the error term replaced by $x/(\log x)^A$ (see, for example, Iwaniec/Kowalski page 124/419)

Thanks very much.

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up vote 4 down vote accepted

Version A is stronger, while Version B is easier to state as it has no condition on $q$.

Version A is usually derived from a result of Page which gives even more information (in terms of possible Siegel zeros). See Corollary 11.17 in Montgomery-Vaughan: Multiplicative number theory I.

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Ah ok I see. Thanks. – Tomos Parry Dec 26 '12 at 11:34

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