Geodesic
A Banach Space Whose Elements are Classes of Sets of Constant Width
Canadian mathematical bulletin, Tome 18 (1975) no. 5, pp. 679-689

Voir la notice de l'article provenant de la source Cambridge University Press

Let K be a compact subset of the real Euclidean space En . We say that K has constant width if the distance between each pair of distinct parallel hyperplanes which support K is constant. The collection of all compact convex subsets of En which have constant width is denoted . 
Lewis, J. E. A Banach Space Whose Elements are Classes of Sets of Constant Width. Canadian mathematical bulletin, Tome 18 (1975) no. 5, pp. 679-689. doi: 10.4153/CMB-1975-119-6
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