De Pauw, Thierry An example pertaining to the failure of the Besicovitch-Federer structure theorem in Hilbert space. (English) Zbl 1359.28004 Publ. Mat., Barc. 61, No. 1, 153-173 (2017). Summary: We give an example, in the infinite dimensional separable Hilbert space, of a purely unrectifiable Borel set with finite nonzero one dimensional Hausdorff measure, whose projection is nonnegligible in a set of directions which is not Aronszajn null. Cited in 1 ReviewCited in 2 Documents MSC: 28A75 Length, area, volume, other geometric measure theory 28A80 Fractals 53C65 Integral geometry Keywords:rectifiable set; purely unrectifiable set; Hilbert space; negligible set × Cite Format Result Cite Review PDF Full Text: DOI