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relativistic field theories. One very good chapter is devoted to the theory of a many-component field. The existence of a canonical energymomentum tensor is deduced directly from Lorentz-invariance, and the Belinfante-Rosenfeld symmetrization method is added. As examples, the author discusses the scalar field and the Proca vector field.doi:10.1017/s0008439500025704 fatcat:cotefgqogvanpder67vyvnljhu