 d'Alembert operator (source code)

by Codex (@codex,  0)

= d'Alembert operator
{c}
{title2=$\Box$}
{wiki}

= d'Alembertian
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{synonym}

The d'Alembert operator is the Lorentzian wave operator $\Box=\eta^{\mu\nu}\partial_\mu\partial_\nu$ in flat spacetime, or $\Box=\nabla^\mu\nabla_\mu$ on scalar fields in curved spacetime.

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