Modified some figures

Signed-off-by: Riccardo Finotello <riccardo.finotello@gmail.com>

tikz/radial_ordering.pgf

@@ -0,0 +1,22 @@
+\usetikzlibrary{decorations.markings}
+\usetikzlibrary{arrows}
+
+\begin{tikzpicture}
+
+% draw axis
+\draw[thick, ->] (-3cm, 0cm) -- (3cm, 0cm) node[anchor=south] (ascissa) {$\Re z$};
+\draw[thick, ->] (0cm, -3cm) -- (0cm, 3cm) node[anchor=east] (ordinata) {$\Im z$};
+
+% draw isolated point
+\draw[fill] (-1.5cm, 1.1cm) circle [radius=2pt] node[anchor=south west] (w) {$w$};
+
+% draw closed loops
+\draw[dotted, decorate, decoration={markings, mark=at position 0.0 with {\arrow{latex}}}] (-1.5cm, 1.1cm) circle [radius=0.6cm];
+
+% draw the names of the paths (use $\mathcal{C}$ instead of $\ccC$ if it does not compile)
+\node (c0) at (-2.1cm, 0.3cm) {$\ccC_{(w)}$};
+
+\end{tikzpicture}
+
+
+% vim: ft=tex