Geodesic
Properties of the distance function to strongly and weakly convex sets in a nonsymmetrical space
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 5 (2020), pp. 22-38

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We consider the distance function (DF), given by the caliber (the Minkowski gauge function) of a convex body, from a point to strictly, strongly and weakly convex sets in an arbitrary Hilbert space. Some properties of the caliber of a strongly convex set and the conditions for obtaining a strict, strong or weak convexity of Lebesgue sets of the distance function are established in accordance with the requirements for the set, the caliber of which specifies the distance function, and the set to which the distance is measured. The corresponding inequalities are obtained that reflect the behavior of the distance function on segments and allow comparing it with strictly, strongly or weakly convex functions.
Keywords: gauge of a set, distance function (DF), strongly and weakly convex sets and functions. 
@article{IVM_2020_5_a2,
     author = {S. I. Dudov and E. S. Polovinkin and V. V. Abramova},
     title = {Properties of the distance function to strongly and weakly convex sets in a nonsymmetrical space},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {22--38},
     publisher = {mathdoc},
     number = {5},
     year = {2020},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2020_5_a2/}
}
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S. I. Dudov; E. S. Polovinkin; V. V. Abramova. Properties of the distance function to strongly and weakly convex sets in a nonsymmetrical space. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 5 (2020), pp. 22-38. http://geodesic.mathdoc.fr/item/IVM_2020_5_a2/