Abstract
I AM afraid Dr. Iben and I have been misunderstanding each other. In my communication I pointed out that an integral involving only the density and pressure of the material could not reveal the particle number. I correctly referred to a contrary statement by Eddington; but I mistakenly also referred to Dr. Iben's paper, which I had misunderstood. I now appreciate that no such error does in fact occur in his paper. On the other hand, Dr. Iben has misunderstood my communication. I stressed at the beginning that I was discussing integrals involving only the density and pressure of the material, and used the words ‘relativistic integral’ further on merely as a shorthand for this. In particular, I was thinking of Eddington's identification of the energy invariant as particle number density.
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BONDI, H. Gravitational Collapse. Nature 203, 1202 (1964). https://doi.org/10.1038/2031202b0
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DOI: https://doi.org/10.1038/2031202b0
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