Abstract
We determine how big an Euler product can be at $s_2$, when its size at $s_1$ is known, and apply this via Halász's method to bound the mean value of a multiplicative function in terms of the size of the generating Dirichlet series.
Citation
Hugh L. Montgomery. Robert C. Vaughan. "Local variation of Euler products." Funct. Approx. Comment. Math. 39 (2) 273 - 288, December 2008. https://doi.org/10.7169/facm/1229696576
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