This paper responds briefly to the criticism of Rodrigues and Rosa on my earlier analysis of the twin paradox. The main point that I have emphasized (and that the authors have not refuted, either logically or mathematically) is the error in directly identifying anabstract measurerelative to a reference frame and its transformations to all other possible reference frames in which the laws of nature are to be compared (such as temporal and spatial measures), with aphysical extension and durationof a material body.
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