deletions | additions       diff --git a/Quantizing K G equation.tex b/Quantizing K G equation.tex  index bc47dea..16dba16 100644  --- a/Quantizing K G equation.tex  +++ b/Quantizing K G equation.tex 
...
\item Action: (Lagrangian density and Lagrangian)  $$S[\phi(\mathbf{x},t)] = \int_{t_1}^{t_2} dt \int d^3 x \mathcal{L}(\phi(\mathbf{x},t), \dot{\phi}(\mathbf{x},t), \nabla\phi(\mathbf{x},t))$$  Example: small \begin{enumerate}   \item Small  transverse fluctuations of a violin strings. $\mathcal{L} = \frac{1}{2}\rho \dot{\phi}^2 - \frac{1}{2} T (\phi')^2$ \item EM in $A_0 = 0$ gauge. $\mathcal{L} = -\frac{1}{4}F_{\mu \nu}F^{\mu \nu}$     \end{enumerate}  \end{enumerate}