Klein-Gordon equation in Einstein notation

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Ciro Santilli 32 Updated 2024-09-07 Created 1970-01-01

The Klein-Gordon equation can be written in terms of the D'alembert operator as:

□ ψ + m^{2} ψ = 0

\partial_{i} \partial^{i} ψ - m^{2} ψ = 0