Formula_23888

\[\hat{H}\left(e^{\frac{i}{\hbar} S(x)} \varphi(x)\right) \sim e^{\frac{i}{\hbar} S(x)} \sum_{k=0}^{\infty} F_{k}\left(x, S, \frac{\partial}{\partial x}\right) \varphi \cdot h^{k} .\]