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## Homework Statement

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

## 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]

## 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.