Definition:Integer Reciprocal Space

Definition
Let $\left({\R, \tau_d}\right)$ be the real number line $\R$ under the usual (Euclidean) topology $\tau_d$.

Let $A \subseteq \R$ be the set of all points on $\R$ defined as:
 * $A := \left\{{\dfrac 1 n : n \in \Z_{>0}}\right\}$

That is:
 * $A := \left\{{1, \dfrac 1 2, \dfrac 1 3, \dfrac 1 4, \ldots}\right\}$

Then $\left({A, \tau_d}\right)$ is the integer reciprocal space.