怎样学好“平方根”与“算术平方根”

平方根与算术平方根是实数中两个非常重要的概念，也是第十章的重点和难点．初学者易混淆这两个概念．要全面掌握它们，应注意以下三点：

General divisor functions in arithmetic progressions to large moduli

We prove a result on the distribution of the general divisor functions in arithmetic progressions to smooth moduli which exceed the square root of the length.