Haifeng Yang deleted file Quantizing K-G equation.tex  over 10 years ago

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\subsection{Quantizing K-G equation: $\ddot{\phi} = (\nabla^2 - m^2)\phi$}     \begin{enumerate}   \item Action:   $$S[\phi(\mathbf{x},t)] = \int_{t_1}^{t_2} dt \int d^3 x $$     \end{enumerate}