in p. 73-74 of the book by Tenenbaum I see the following notation to define $a_n$. Could anyone help to understand the notation? thanks.
2026-03-25 09:37:22.1774431442
notation meaning in the book "Introduction to Analytic and Probabilistic Number Theory"
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It's the indicator function that $n/R \in \mathbb{N}$. Formally: $$ 1_{\mathbb{N}}(n/R) = \begin{cases} 1, &\text{if $n/R \in \mathbb{N}$} \\ 0, &\text{if $n/R \notin \mathbb{N}$} \end{cases} $$