Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the Riesz means of $\delta_k(n)$   Let $k\geq 1$ be an integer. Let $\delta_k(n)$ denote the maximum divisor of
$n$ which is co-prime to $k$. We study the error term of the general $m$-th
Riesz mean of the arithmetical function $\delta_k(n)$ for any positive integer
$m \ge 1$, namely the error term $E_m(x)$ where
  \[ \frac{1}{m!}\sum_{n \leq x}\delta_k(n) \left( 1-\frac{n}{x} \right)^m =
M_{m, k}(x) + E_{m, k}(x). \] We establish a non-trivial upper bound for $\left
| E_{m, k} (x) \right |$, for any integer $m\geq 1$.

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The categories of this paper are: hep-ph
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The categories of this paper are: econ
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The categories of this paper are: acc-phys
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The categories of this paper are: ao-sci
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The categories of this paper are: q-fin
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The categories of this paper are: q-alg
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The categories of this paper are: cond-mat
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The categories of this paper are: chem-ph
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The categories of this paper are: eess
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The categories of this paper are: funct-an
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The categories of this paper are: cmp-lg
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The categories of this paper are: dg-ga
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The categories of this paper are: patt-sol
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The categories of this paper are: cs
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-lat