I want to put two images side by side and put a comparison symbol in between them. Here is the tikz code :
\documentclass{article}
\usepackage{tikz}
\usepackage[margin=15mm]{geometry}
\usepackage{calc}
\usetikzlibrary{matrix,arrows}
\usetikzlibrary{positioning,arrows}
\usetikzlibrary{shapes,arrows,fit,calc,positioning,automata}
\begin{document}
\begin{tikzpicture}[node distance=5cm,auto,>=latex', scale = 0.75, transform shape]
\coordinate (a1) [] {};
\node[rectangle] (a) [draw,minimum width=2cm,minimum height=1cm, below of=a1,node distance=1.5cm] { };
\node[rectangle] (b) [draw,minimum width=2cm,minimum height=1cm, below of=a,node distance=2cm] { };
\coordinate[below=1cm of b] (b1) {};
\path[->] (a) edge node {{$\gamma$} } (b);
\path[->] (a1) edge node {{$\alpha.\beta$} } (a);
\path[->] (b) edge node {{$\delta$} } (b1);
\end{tikzpicture}
\begin{tikzpicture}[node distance=5cm,auto,>=latex', scale = 0.75, transform shape]
\coordinate (a1) [] {};
\node[rectangle] (a) [draw,minimum width=4cm,minimum height=1cm, below of=a1,node distance=1.5cm] {};
\coordinate[below=1cm of a] (b1) {};
\path[->] (a1) edge node { $\alpha.\beta$ } (a);
\path[->] (a) edge node { $\delta$ } (b1);
\end{tikzpicture}
\end{document}
I want to put these to images side by side with an equality symbol in between them. How do I do that?