Let $f: \mathbb{R} \to \mathbb{C}$ such that for some constant $C \in \mathbb{R}$,
$$|f(t)| \leq \frac{C}{1+t^2}$$
for all $t \in \mathbb{R}$.
Is there anything that can be concluded about the series
$$\sum_{k \in \mathbb{Z}}f(x+2k\pi)$$?
Let $f: \mathbb{R} \to \mathbb{C}$ such that for some constant $C \in \mathbb{R}$,
$$|f(t)| \leq \frac{C}{1+t^2}$$
for all $t \in \mathbb{R}$.
Is there anything that can be concluded about the series
$$\sum_{k \in \mathbb{Z}}f(x+2k\pi)$$?
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