Abstract
INFELD has shown how the field equations of my new electrodynamics can be written so as not to require an æther. This is not sufficient to make a complete dynamical theory. It is necessary to set up an action principle and to get a Hamiltonian formulation of the equations suitable for quantization purposes, and for this the æther velocity is required.
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DIRAC, P. Is there an Æther?. Nature 169, 702 (1952). https://doi.org/10.1038/169702b0
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DOI: https://doi.org/10.1038/169702b0
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