My.SUPA

$$x\div~y$$ gives $x\div~y$

• Syntax: \left\|...\right\|
• Exp.: $$\left\|af\right\| = \left|a\right|\left\|f\right\|$$ gives

$\left\|af\right\| = \left|a\right|\left\|f\right\|$

$$\epsilon$$ gives $\epsilon$

• With two triple $'s embracing an expression you can make the filter to escape and the code itself is shown (with two embracing double $'s).
• Ex.: $$$a^2$$$ produces $$a^2$$, i.e. prevents the filter to render it as a formula gif.

$$\eta$$ gives $\eta$

feynMF and feynMP is a tool made by Thorsten Ohl to draw Feynman diagrams in LaTeX.

In his paper, [Ohl 1995], he explains how his package along with LaTeX and Metafont can be used to draw such diagrams.

This package has been installed on the SUPA web server, and My.SUPA has been modified to allow such diagrams to be shown in course pages, wikis and forums.

$$
\unitlength = 1mm
\begin{fmffile}{simpletwo}
\begin{fmfgraph}(60,45)
\fmfleft{i1,i2}
\fmfright{o1,o2}
\fmf{fermion}{i1,v1,o1}
\fmf{fermion}{i2,v2,o2}
\fmf{photon}{v1,v2}
\end{fmfgraph}
\end{fmffile}
$$

$\unitlength = 1mm \begin{fmffile}{simpletwo} \begin{fmfgraph}(60,45) \fmfleft{i1,i2} \fmfright{o1,o2} \fmf{fermion}{i1,v1,o1} \fmf{fermion}{i2,v2,o2} \fmf{photon}{v1,v2} \end{fmfgraph} \end{fmffile}$

Note all examples using feynmp articles need to be wrapped in the following code to start a new feynman diagram environment at a sensible size.

$$ ....... starts LaTeX interpretation
\unitlength = 1mm
\begin{fmffile}{tmpfile} ..... temp name does not matter
\begin{fmfgraph*}(40,30) ..... increase x,y size of diagram here
... example goes here ...
\end{fmfgraph*}
\end{fmffile}
$$

$$\fbox{x=\frac{1}{2}}$$  gives

$\fbox{x=\frac{1}{2}}$

• Syntax: \frac{numerator}{denominator}
• Use font sizing commands for specific sizing if you don't want the predefined one to be taken.
• Ex. (with predefined sizing): $$f(x,y)=\frac{2a}{x+y}$$ gives

$f(x,y)=\frac{2a}{x+y}$

• Ex. (with specific sizing): $$f(x,y)=\frac{\fs{2}2a}{\fs{2}x+y}$$ gives

$f(x,y)=\frac{\fs{2}2a}{\fs{2}x+y}$

• You may nest fractions as much as you want.
• Ex. (nested fractions): $$\frac{\frac{a}{x-y}+\frac{b}{x+y}}{1+\frac{a-b}{a+b}}$$ gives

$\frac{\frac{a}{x-y}+\frac{b}{x+y}}{1+\frac{a-b}{a+b}}$

Function names supplied by LaTeX:

\arccos \cos \csc \exp \ker \limsup
\arcsin \cosh \deg \gcd \lg \ln
\arctan \cot \det \hom \lim \log
\arg \coth \dim \inf \liminf \max
\sinh \sup \tan \tanh \min \Pr
\sec \sin

$$\gamma$$ gives $\gamma$