The union of flat \((n-1)\)-balls is flat in \(R^ n\). (English) Zbl 0157.54603


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[1] A. V. Černavskiĭ, On singular points of topological imbeddings of manifolds and the union of locally flat cells, Dokl. Akad. Nauk SSSR 167 (1966), 528 – 530 (Russian).
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[3] T. Hutchinson, Two-point spheres are flat, Notices Amer. Math. Soc. 14 (1967), 364, Abstract 644-18.
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