| 11. | It defines a covariant derivative \ mathcal { D } _ a.
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| 12. | The indices of covariant coordinates, vectors, and tensors are subscripts.
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| 13. | Thus the objects with covariant indices are four-vectors as well.
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| 14. | Thus a one-form is an order 1 covariant tensor field.
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| 15. | Such a transformation law is known as a covariant transformation.
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| 16. | Thus the covariant derivative of a supermultiplet is another supermultiplet.
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| 17. | The most popular approach is probably the definition motivated by covariant derivatives.
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| 18. | This is exactly the kind of programs that covariant interface types allow.
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| 19. | In 1934 he devised a fully covariant perturbation theory for quantum fields.
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| 20. | The Coulomb gauge is, however, not Lorentz covariant.
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