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Lytchak, Alexander; Stadler, Stephan (2019): Conformal deformations of CAT(0) spaces. In: Mathematische Annalen, Vol. 373, No. 1-2: pp. 155-163
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We show that the class of CAT(0) spaces is closed under suitable conformal changes. In particular, any CAT(0) space admits a large variety of non-trivial deformations.