Expand knowledge base

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diff --git a/sources/know/concept/feynman-diagram/main.tex b/sources/know/concept/feynman-diagram/main.tex
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+\documentclass[11pt]{article}
+\usepackage[utf8]{inputenc}
+\usepackage{amsmath}
+\usepackage{amsfonts}
+\usepackage{physics}
+
+\usepackage{feynmp}
+\DeclareGraphicsRule{*}{mps}{*}{}
+
+\begin{document}
+
+\begin{center}
+	{\Huge \sc Feynman diagrams}
+\end{center}
+
+\begin{fmffile}{freegf}
+	\begin{fmfgraph*}(110,60)
+		\fmfleft{v1}
+		\fmfright{v2}
+		\fmflabel{$(\mathbf{r}_1,t_1,s_1)$}{v1}
+		\fmflabel{$(\mathbf{r}_2,t_2,s_2)$}{v2}
+		\fmf{fermion}{v1,v2}
+		\fmfdot{v1}
+		\fmfdot{v2}
+	\end{fmfgraph*}
+\end{fmffile}
+
+\begin{fmffile}{fullgf}
+	\begin{fmfgraph*}(110,60)
+		\fmfleft{v1}
+		\fmfright{v2}
+		\fmflabel{$(\mathbf{r}_1,t_1,s_1)$}{v1}
+		\fmflabel{$(\mathbf{r}_2,t_2,s_2)$}{v2}
+		\fmf{heavy}{v1,v2}
+		\fmfdot{v1}
+		\fmfdot{v2}
+	\end{fmfgraph*}
+\end{fmffile}
+
+\begin{fmffile}{perturbation}
+	\begin{fmfgraph*}(110,60)
+		\fmfleft{i}
+		\fmfright{o}
+		\fmf{vanilla}{i,m}
+		\fmf{vanilla}{m,o}
+		\fmfv{decoration.shape=hexagram,label=$(\mathbf{r},t,s)$,label.angle=-90}{m}
+		\fmflabel{$(\mathbf{r},t,s)$}{m}
+	\end{fmfgraph*}
+\end{fmffile}
+
+\begin{fmffile}{interaction}
+	\begin{fmfgraph*}(110,60)
+		\fmfleft{v1}
+		\fmfright{v2}
+		\fmflabel{$(\mathbf{r}_1,t_1,s_1)$}{v1}
+		\fmflabel{$(\mathbf{r}_2,t_2,s_2)$}{v2}
+		\fmf{boson}{v1,v2}
+		\fmfdot{v1}
+		\fmfdot{v2}
+	\end{fmfgraph*}
+\end{fmffile}
+
+\begin{fmffile}{conservation}
+	\begin{fmfgraph*}(110,60)
+		\fmfleft{i1,o1}
+		\fmfright{i2,o2}
+		\fmf{fermion,label=$\tilde{\mathbf{k}}_1$}{i1,v1}
+		\fmf{fermion,label=$\tilde{\mathbf{k}}_2$}{v1,o1}
+		\fmf{fermion,label=$\tilde{\mathbf{q}}_1$,label.side=left}{i2,v2}
+		\fmf{fermion,label=$\tilde{\mathbf{q}}_2$}{v2,o2}
+		\fmf{boson,label=$\mathbf{p}$}{v1,v2}
+		\fmfdot{v1}
+		\fmfdot{v2}
+		\fmfv{label=$\tilde{\mathbf{r}}_1$,label.angle=180}{i1}
+		\fmfv{label=$\tilde{\mathbf{r}}_1'$,label.angle=180}{o1}
+		\fmflabel{$\tilde{\mathbf{r}}$}{v1}
+		\fmflabel{$\tilde{\mathbf{r}}'$}{v2}
+		\fmfv{label=$\tilde{\mathbf{r}}_2$,label.angle=0}{i2}
+		\fmfv{label=$\tilde{\mathbf{r}}_2'$,label.angle=0}{o2}
+	\end{fmfgraph*}
+\end{fmffile}
+
+\end{document}