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[Phys-l] math notation question



How widespread is the use of \Delta instead of \nabla^2 to mean the
Laplacian operator in 3-D?

In 4-D Minkowski space the Laplacian becomes the d'Alembertian. Should the
d'Alembertian operator be a square with or without a superscript 2? I've
seen it both ways.

Thanks,
Larry