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Closed subsets of a CAT(0) 2-complex are intrinsically CAT(0)
Published 30 Aug 2019 in math.MG | (1909.00048v1)
Abstract: Let k be at most 0, and let X be a locally-finite CAT(k) polyhedral 2-complex X, each face with constant curvature k. Let E be a closed, rectifiably-connected subset of X with trivial first singular homology. We show that E, under the induced path metric, is a complete CAT(k) space.
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