Abstract
In this paper we study the four-dimensional divisor problem of $(a,b,c,c)$ type, where $1\leq a\leq b<c$ are fixed integers. Our theorems improve some classical results. As an application, we study the error term of the summatory function of the exponential totient function.
Citation
Xiaodong Cao. Wenguang Zhai. "On the four-dimensional divisor problem of $(a,b,c,c)$ type." Funct. Approx. Comment. Math. 49 (2) 251 - 267, December 2013. https://doi.org/10.7169/facm/2013.49.2.5
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