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**1. Homework Statement**

Show that (D'Alembertian)^2 is invariant under Lorentz Transformation.

**2. Homework Equations**

The book (E/M Griffiths) describes the D'Alembertian as:

[tex]\square^2=\nabla^2-\frac{1}{c^2}\frac{\partial^2}{\partial t^2}[/tex]

**3. The Attempt at a Solution**

I don't really know what it is asking me to do here. Any guidance at where to even start would be very helpful. I am not very good at writing out proofs.