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Nov 6, 2018 at 23:27 history edited YCor
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Oct 24, 2018 at 8:01 comment added Igor Khavkine To supplement Pedro's excellent answer, you might also be interested in the article "The space of Lorentz metrics" by David E. Lerner CMP 32 19 (1973), where he discusses the stability of various causal properties with respect to the Whitney topologies.
Oct 24, 2018 at 3:39 vote accept L.F. Cavenaghi
Oct 24, 2018 at 3:27 answer added Pedro Lauridsen Ribeiro timeline score: 14
Oct 24, 2018 at 1:57 history edited L.F. Cavenaghi CC BY-SA 4.0
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Oct 24, 2018 at 1:43 history asked L.F. Cavenaghi CC BY-SA 4.0