在“On the divisor and circle problems"论文中(J.Number Theory, 29(1988), 60-93),H.Iwaniec和C.J.Mozzochi用了好几个光滑辅助函数("光滑"指无穷次可导),其中一个光滑函数要求满足:(a)当x<1或x>4时X(x)=0;(b)当1≤x≤4时0≤X(x)≤1;(c)当1≤x≤2时X(x)=1-X(2x)。满足条件(
comScore said today that US Internet users viewed 12 billion videos in May up 45% year-over-year. As expected, Google’s video properties dominated with 35% of the video market, 98% of that due to