We establish an external criterion for the convexity of a domain of a Euclidean space.
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Yu. B. Zelinskii and I. V. Momot, “On (n, m)-convex sets,” Ukr. Mat. Zh., 53, No. 3, 422–427 (2001).
E. H. Spanier, Algebraic Topology, McGraw-Hill, New York (1966).
E. V. Shchepin, “Criterion for convexity of an open set,” in: Abstracts of the Third Tiraspol Symposium on General Topology and Its Applications [in Russian], Shtiintsa, Kishenev (1973), p. 146.
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Translated from Ukrains’kyi Matematychnyi Zhurnal, Vol. 60, No. 5, pp. 709–711, May, 2008.
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Zelinskii, Y.B., Vygovskaya, I.Y. Criterion for convexity of a domain of a Euclidean space. Ukr Math J 60, 816–818 (2008). https://doi.org/10.1007/s11253-008-0086-8
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DOI: https://doi.org/10.1007/s11253-008-0086-8