Electromagnetic wave equation in Einstein Notation

1. Feb 28, 2013

smoking-frog

Hey!

How to transform the equation
$$\bigtriangleup\vec E=\operatorname{div}(\operatorname{grad}(\vec E))=\epsilon_0\cdot\mu_0\cdot\frac{\partial^2\vec E}{\partial t^2}$$ in Einstein Notation?

Thank you all for your help!

2. Feb 28, 2013

tiny-tim

hey smoking-frog!

show us your attempt

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