Geodesic
The spherical symmetrization and NED-sets on a hyperplane
Zapiski Nauchnykh Seminarov POMI, Analytical theory of numbers and theory of functions. Part 27, Tome 404 (2012), pp. 248-258 
V. A. Shlyk. The spherical symmetrization and NED-sets on a hyperplane. Zapiski Nauchnykh Seminarov POMI, Analytical theory of numbers and theory of functions. Part 27, Tome 404 (2012), pp. 248-258. http://geodesic.mathdoc.fr/item/ZNSL_2012_404_a15/
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     title = {The spherical symmetrization and {NED-sets} on a~hyperplane},
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Voir la notice du chapitre de livre provenant de la source Math-Net.Ru

The simple sufficient condition of NED-sets on a hyperplane are derived in terms of spherical approachability of its points from complement of this set on the hyperplane.

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