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# Klein-Gordon equation

nosplit "Dirac equation" words: 353
A relativistic version of the Schrödinger equation.
Correctly describes spin 0 particles.
The most memorable version of the equation can be written as shown at Section "Klein-Gordon equation in Einstein notation" with Einstein notation and Planck units: $$∂i​∂iψ−m2ψ=0 (2)$$
Has some issues which are solved by the Dirac equation: