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This is not the case of we use the Johnson-Low definition of E. T. limit (12).
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In Brandt’s paper formula (2) has been criticized as not giving an unique result (ref. (2), p. 1800) and as an example the case of a free field is given. It can be easily shown, however, that this statement is not true.
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Lukierski, J. Equal-time commutators for the renormalized current in quantum electrodynamics. Lettere Nuovo Cimento (1969-1970) 1, 259–262 (1969). https://doi.org/10.1007/BF02752502
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DOI: https://doi.org/10.1007/BF02752502