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## Main Question or Discussion Point

Hi,

Why the wave equation is

[tex]\frac{\partial^2 u}{\partial^2 x}=c^2\nabla^2 u[/tex]?

Where does it come from?Thanks.

Why the wave equation is

[tex]\frac{\partial^2 u}{\partial^2 x}=c^2\nabla^2 u[/tex]?

Where does it come from?Thanks.