a question about wikipedia

A bad physicist once asked me, "I read on wikipedia that the path integral has made other formalisms obsolete  I didn't understand. can you explain?"

I said , " sure. It is very difficult to think like this. you have to be as good at maths as string theorists ..


$Z \propto \int \mathcal{D} \varphi \int \mathcal{D} X^{\mu} \mathcal{D} c^- \mathcal{D} c^+ \mathcal{D} b_{--} \mathcal{D} b_{++} e^{ i( S + S_{FP} ) }$

$S_{FP} = \frac{1}{\pi} \int d^2 \sigma ( c^- \Delta_{+} b_{--} + c^+ \Delta_{-} b_{++} )$