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Aug 12, 2021 at 12:42 comment added Jorge Vitório Pereira @SamNead: I expanded my answer to include the counterexamples by Epstein and VVogt in dimension four.
Aug 12, 2021 at 12:06 comment added Sam Nead I assume, from your comments, that the conjecture is open in dimension four? If so, is this on some problem list someplace? (Because, it should be!)
Aug 12, 2021 at 7:28 history answered Misha Verbitsky CC BY-SA 4.0