Relativistic Fields
When it was realised that Lorentz invariance is an essential feature of nature, it became desirable to model everything as a relativistic field. This could be conveniently done under the formalism of relativistic (or covariant) classical field theory.
This works by finding a Lorentz scalar, the Lagrangian density, from which the field equations and symmetries can be readily derived.
Read more about this topic: Field Equation
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