University of Sydney

Abstract
I much appreciate the kind tone of Dr. Builder's letter, which makes me wish I could agree with him about the clock paradox. I am afraid, however, that that is impossible. If Dr. Builder disagrees with the first two paragraphs of Einstein's paper, the discussion is radically altered. In those paragraphs Einstein stated the two postulates—of relativity and of constant light velocity—on which the rest of the paper is based.

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