- #1
eoghan
- 207
- 7
Homework Statement
Itzykson-Zuber ch. 9-1-1:
If
[tex]H=\frac{P^2}{2m}-QF(t) [/tex]
then
[tex]\frac{\delta}{i\delta F(t)}\langle f\mid i\rangle_F=\langle f\mid Q(t)\mid i \rangle_F[/tex]
Ok, I understand that.
But then it states: if
[tex]H=\frac{P^2}{2m}+V(Q)[/tex]
then
[tex]\int\mathcal{D}(q)\exp\left\{i\int dt\left[\frac{m\dot q^2}{2}-V(q)\right]\right\}=\exp\left\{-i\int dt V\left[\frac{\delta}{i\delta F(t)}\right]\right\}\langle f\mid i\rangle_F\big|_{F=0}[/tex]
I can't understand this formula...
The Attempt at a Solution
I tried everything all week long