Review Exercises for Chapter 4

A: Describe (but don't reproduce) how you would make the following example of `Feyn Art':

$\begin{picture}(28000,8000) %T: \drawline\gluon[\N\CENTRAL](0,0)[5] \global\Yone... ...Ytwo] \drawline\fermion[\NW\REG](\photonbackx,\photonbacky)[\Ytwo] \end{picture}$
B: Reproduce the `balloon in the tree' diagram:

$\begin{picture}(28000,28000) \THICKLINES %set up position of bottom of loop \sta... ...two by \Xthree \drawline\photon[\NE\FLIPPED](\loopfrontx,\Ytwo)[5] \end{picture}$