Abstract
Suppose thatA ⊂R n is a bounded set of diameter 1 and that:f:A →l 2 is a map satisfying the nearisometry condition |x−y|−ɛ≤|fx−fy|≤|x−y|+ɛ withɛ≤1. Then there is an isometryS:A →l 2 such that |Sx−fx|≤c n √ɛ for allx inA. IfA satisfies a thickness condition and iff:A →R n, then there is an isometryS:R n →R n with |Sx−fx|≤c nɛ/q, whereq is a thickness parameter.
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Alestalo, P., Trotsenko, D.A. & Väisälä, J. Isometric approximation. Isr. J. Math. 125, 61–82 (2001). https://doi.org/10.1007/BF02773375
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DOI: https://doi.org/10.1007/BF02773375