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Klein-Gordon equation in Einstein notation

Ciro Santilli (@cirosantilli, 37) ... Linear algebra Tensor Einstein notation Einstein notation for partial derivatives Laplacian in Einstein notation d'Alembert operator in Einstein notation
Updated 2025-07-16  0 By others on same topic  0 Discussions Create my own version
The Klein-Gordon equation can be written in terms of the d'Alembert operator as:
□ψ+m2ψ=0
(1)
so we can expand the d'Alembert operator in Einstein notation to:
∂i​∂iψ−m2ψ=0
(2)

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