\usepackage{tikz}
\usepackage{amssymb}
\usetikzlibrary{plotmarks}
\begin{document}
%---------------------------------------------------------
\begin{tikzpicture}
\coordinate (A) at (1,0);
\coordinate (B) at (9,0);
\draw (0,0) -- (10,0) ;
\path node[mark size=3pt,color=red] at (A) {\pgfuseplotmark{*}} node at (A) [above=5pt] {$m \in \mathbb{Z}$} node[mark size=3pt,color=red] at (B) {\pgfuseplotmark{*}} node at (B) [above=5pt] {$n \in \mathbb{Z}$};
\draw[latex-latex] ([yshift=-0.5cm]A) -- node[below] {Distance $\ge 1$}([yshift=-0.5cm]B) ;
\end{tikzpicture}
%---------------------------------------------------------
\end{document}