D'Alembertian operator

In special relativity and electromagnetism and wave theory, the d'Alembertian operator is defined by:

<math>\Box^2 = \nabla^2 - \frac{1}{c^2} \frac{\partial^2}{\partial t^2}<math>

Note: Some articles/textbooks use the opposite sign convention.

As with other operators in special relativity, the d'Alembertian operator is invariant under a Lorentz transformation.

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