Geodesic
A Note on the Borsuk Conjecture
Canadian mathematical bulletin, Tome 10 (1967) no. 1, pp. 1-3

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According to the still unproved conjecture of Borsuk [1] a bounded subset A of the Euclidean n-space En is a union of n + 1 sets of diameters less than the diameter D of A. Since A can be imbedded in a set of constant width D, [2], it may be assumed that A is already of constant width. If in addition A is smooth, i. e., if through every point of its boundary ∂A there passes one and only one support plane of A, then the truth of Borsuk′s conjecture can be proved very easily [3]. The question arises whether Borsuk′s conjecture holds also for arbitrary smooth convex bodies, not merely for those of constant width. Since it is not known whether a smooth convex body K can be imbedded in a smooth set of constant width D, the answer is not immediate. In this note we show that the answer is affirmative. 
Melzak, Z.A. A Note on the Borsuk Conjecture. Canadian mathematical bulletin, Tome 10 (1967) no. 1, pp. 1-3. doi: 10.4153/CMB-1967-001-1
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