diff --git a/diagram_circle_lemma.tex b/diagram_circle_lemma.tex
new file mode 100644
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--- /dev/null
+++ b/diagram_circle_lemma.tex
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+\documentclass{standalone}
+\usepackage[T1]{fontenc}
+\usepackage{amsmath}
+\usepackage{amsfonts}
+\usepackage{parskip}
+\usepackage[usenames,dvipsnames]{color}
+\usepackage[hidelinks]{hyperref}
+\renewcommand*{\familydefault}{\sfdefault}
+
+\usepackage{bbm} %For \mathbbm{1}
+%\usepackage{bbold}
+\usepackage{tikz}
+
+\begin{document}
+
+\begin{tikzpicture}[scale=0.8]
+    \def\r{4};
+    \def\step{15};
+
+    % Line and circles
+    \foreach \a in {0,...,23} {
+        \draw[-] ({\a*\step}:\r) -- ({(\a+1)*\step}:\r);
+        \draw ({\a*\step}:\r) circle (0.05);
+    }
+
+    % Red dots
+    \foreach \a in {2,3,6,8,9,10,11,14,15,17,20} {
+        \draw[fill,red] ({\a*\step}:\r) circle (0.09);
+    }
+    % Blue squares
+    \foreach \a in {2,3,20} {
+        \draw[fill,blue] ({\a*\step}:{\r-0.3})+(-0.1,-0.1) rectangle +(0.1,0.1);
+    }
+    % Green triangles
+    \foreach \a in {6,8,9,10,11,14,15,17} {
+        \draw[fill,green] ({\a*\step}:{\r-0.3}) +(-0.15,-0.1) -- +(0.15,-0.1) -- +(0,0.15);
+    }
+
+    % Legend
+    \draw (-1,0)+(-0.5,-1) rectangle +(2.2,1);
+    \draw[fill,red]   (-1.1,0.5)  circle (0.09);
+    \draw[fill,blue]  (-1.1,0)    +(-0.1,-0.1) rectangle +(0.1,0.1);
+    \draw[fill,green] (-1.1,-0.5) +(-0.15,-0.1) -- +(0.15,-0.1) -- +(0,0.15);
+    \draw[anchor=west] (-1,0.5)  node {$I$};
+    \draw[anchor=west] (-1,0)    node {$I_{\mathrm{in}(n-l,k)}$};
+    \draw[anchor=west] (-1,-0.5) node {$I_{\mathrm{out}(n-l,k)}$};
+
+
+    % Bigger circle
+    \foreach \a in {-5,...,3} {
+        \draw[-,dashed] ({\a*\step}:\r+1) -- ({(\a+1)*\step}:\r+1);
+        %\draw ({\a*\step}:\r+1) circle (0.05);
+    }
+    \draw ({-5*\step}:\r+1) +(0.2,-0.2) node {$n-l$};
+    \draw ({4*\step}:\r+1) +(0.2,0.2) node {$k$};
+
+
+    %
+    % Arrows with labels
+    %
+
+    % 0
+    \draw ({0*\step}:\r-0.3) node {$0$};
+    % 1
+    \draw ({1*\step}:\r-0.3) node {$1$};
+    % n/2
+    \draw ({12*\step}:\r-0.3) node {$\frac{n}{2}$};
+    % i_*
+    \draw[->] ({10*\step}:\r-1) -- ({10*\step}:\r-0.2);
+    \draw ({10*\step}:\r-1) +(0.3,0) node {$i_*$};
+    % n-1
+    \draw ({-1*\step}:\r-0.3) +(-0.4,0) node {$n-1$};
+\end{tikzpicture}
+\end{document}