Quasi-Möbius homeomorphisms of Morse boundaries are induced by quasi-isometries

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Let XX and YY be proper, cocompact CAT(0) spaces, and let f:XYf:\partial_*X\to\partial_*Y be a homeomorphism, where X\partial_*X and Y\partial_*Y denote their Morse boundaries. A homeomorphism is 2-stable if it preserves the relevant 2-stable pairs, and quasi-Möbius if it distorts cross-ratios in the prescribed quasi-Möbius sense. Quasi-Möbius homeomorphism conjecture. Every quasi-Möbius homeomorphism

f:XYf:\partial_*X\to\partial_*Y

is 2-stable and hence is induced by a quasi-isometry h:XYh:X\to Y. The preceding theorem establishes the converse implication under the stated hypotheses, while this conjecture would show that quasi-Möbius behavior alone also forces 2-stability and quasi-isometric origin.

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Primary source

Ruth Charney and Devin Murray, “A rank-one CAT(0) group is determined by its Morse boundary”, arXiv:1707.07028 (2017).

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