d'Alembertian

From Jean le Rond d'Alembert +‎ -ian.

d'Alembertian (plural d'Alembertians)

1. (physics) The d'Alembert operator.
   • 2011, Ashok Das, Lectures on Gravitation, Singapore: World Scientific, page 25:

     Furthermore, we note that ${\displaystyle \partial _{\mu }\partial ^{\mu }=\eta ^{\mu \nu }\partial _{\mu }\partial _{\nu }={{\partial ^{2}} \over {\partial t^{2}}}-\nabla ^{2}=\square }$, which is known as the d'Alembertian, is invariant under Lorentz transformations.