In Feynman lectures in physics v2 28-6, Feynman points out that we can add a constant times [itex]\phi[/itex] to D'Alembertian without distrupting the relativistic invariance. How and why?? Can someone work out a mathematical proof?(adsbygoogle = window.adsbygoogle || []).push({});

Thanks in advance.

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# Relativistic invariance

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