Electromagnetic wave equation in Einstein Notation

smoking-frog
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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!
 
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hey smoking-frog! :smile:

show us your attempt :wink:
 
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