Python macht einfach Spass :-) >>>div=N(P,"/",P) >>>div.set("2","4") >>>div.tex=["("]+div.list+[")"] >>>print T.visit(div) (2/4) >>>div.tex=[r"\frac{",P,"}{",P,"}"] >>>print T.visit(div) \frac{2}{4} Think Geek! Dirk