Hi,

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)

http://en.wikipedia.org/wiki/Siegel%E2%80%93Walfisz_theorem

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.