548 ANSWERS TO EXERCISES 3.3.4 28. Let 5 = ezrz (m-l) and let Ski = CO In fact, DEL1 5 H c T(ZL~, , Ut) [summed over nonzero solutions of (15)] + G&C?-(Ul,…, ut) [summed over all nonzero (pi, . . . , ut)]. The latter sum is O(log m)t by exercise 25 with d = 1, and the former sum is treated as in exercise 27. Let us now consider the quantity R(a) = cr(~l,. . . , ut) summed over nonzero solutions of (15). Since m is prime, each (~1,. , ut) can be a solution to (15) for at most t -1 values of a, hence xOFrom our experience, we are can tell you that you can find a reliable and cheap webhost service at Java Web Hosting services.
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