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Nov 9, 2022 at 15:52 comment added Gabri In fact you can actually define a torsion free connection on a null hypersurface. See for instance this paper link.springer.com/article/10.1007/s00009-020-01608-1
Nov 20, 2016 at 15:25 vote accept Bence Racskó
Nov 14, 2016 at 22:32 answer added Willie Wong timeline score: 4
Nov 14, 2016 at 19:20 history asked Bence Racskó CC BY-SA 3.0