My.SUPA

$$\Phi$$ gives $\Phi$

$$\pi$$ gives $\pi$

$$\Pi$$ gives $\Pi$

$$a\pm~b$$ gives $a\pm~b$

• General syntax for symbols with a kind of lower and upper limits:

\symbolname_{lowerexpression}^{upperexpression}

• In general, there are two ways how these lower and upper expressions can be placed: centered below and above the symbol or in a subscript / superscript manner. In the first case the symbol name is preceded by the word "big", in the second there is no prefix.
• Syntax for product symbol:

$$\bigprod_{i=k}^{n}$$   gives  

$\bigprod_{i=k}^{n}$

and

$$\prod_{i=k}^{n}$$   gives 

$\prod_{i=k}^{n}$

• Use font size commands for a nicer picture:

$$\LARGE\bigprod_{\tiny{i=k}}^{\tiny{n}}$$   gives  

$\LARGE\bigprod_{\tiny{i=k}}^{\tiny{n}}$ 

and

$$\large\prod_{\small{i=k}}^{\small{n}}$$   gives 

$\large\prod_{\small{i=k}}^{\small{n}}$

$$\psi$$ gives $\psi$

$$\Psi$$ gives $\Psi$

Resonant s-channel contribution from Drawing Feynman Diagrams with LaTeX and METAFONT. Part 1

\begin{fmffile}{schannel}
\begin{fmfgraph*}(100,160)
\fmfpen{thick}
\fmfleftn{i}{2}\fmfrightn{o}{4}
\fmflabel{$e_-$}{i1}\fmflabel{$e_+$}{i2}
\fmflabel{$\noexpand\bar c$}{o1}
\fmflabel{$\nu_{\mu}$}{o2}
\fmflabel{$\mu_+$}{o3}
\fmflabel{$s$}{o4}
\fmf{boson,label=$\gamma,,Z$}{v1,v2}
\fmf{fermion}{i1,v1,i2}
\fmf{fermion}{o1,v2,v3,o4}
\fmffreeze \fmf{boson}{v3,v4}\fmf{fermion}{o3,v4,o2}
\fmfdotn{v}{4}
\end{fmfgraph*}
\end{fmffile}

$\begin{fmffile}{schanneltwo} \begin{fmfgraph*}(100,60) \fmfpen{thick} \fmfleftn{i}{2}\fmfrightn{o}{4} \fmflabel{$e_-$}{i1}\fmflabel{$e_+$}{i2} \fmflabel{$\noexpand\bar c$}{o1} \fmflabel{$\nu_{\mu}$}{o2} \fmflabel{$\mu_+$}{o3} \fmflabel{$s$}{o4} \fmfpen{thick} \fmf{boson,label=$\gamma,,Z$}{v1,v2} \fmf{fermion}{i1,v1,i2} \fmf{fermion}{o1,v2,v3,o4} \fmffreeze \fmf{boson}{v3,v4}\fmf{fermion}{o3,v4,o2} \fmfdotn{v}{4} \end{fmfgraph*} \end{fmffile}$

$$\rho$$ gives $\rho$

• Syntax: \left.{...\right}  (note the dot!)
• Ex.: $$\left.{{\rm~term1\atop\rm~term2}\right}=y$$ gives

$\left.{{\rm~term1\atop\rm~term2}\right}=y$

(\rm~something switches to roman style)