Two upper bounds for the Erdős--Hooley Delta-function (2210.13897v1)

Abstract: For integer $n\geqslant 1$ and real $u$, let $\Delta(n,u):=|{d:d\mid n,\,{\rm e}^u<d\leqslant {\rm e}^{u+1}}|$. The Erd\H{o}s--Hooley Delta-function is then defined by $\Delta(n):=\max_{u\in{\mathbb R}}\Delta(n,u).$ We improve the current upper bounds for the average and normal orders of this arithmetic function.