Short interval asymptotics for a class of arithmetic functions

Abstract

We provide a general asymptotic formula which permits applications to sums like ]]> ]]> ]]> ]]> ]]> ]]> $]]> ]]> \sum_{x< n\le x+y} \big(d(n)\big)^2, \quad \sum_{x< n\le x+y} d(n^3),\quad \sum_{x< n\le x+y}\big(r(n)\big)^2, \quad \sum_{x< n\le x+y}r(n^3), $$ where $d(n)$ and $r(n)$ are the usual arithmetic functions (number of divisors, sums of two squares), and $y$ is small compared to~$x$.