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Published online by Cambridge University Press: 01 January 2022
Within the context of general relativity, we consider one definition of a “time machine” proposed by Earman, Smeenk, and Wüthrich. They conjecture that, under their definition, the class of time machine spacetimes is not empty. Here, we prove this conjecture.
I wish to thank John Earman, David Malament, Christopher Smeenk, and Christian Wüthrich for helpful discussions on this topic.