Abstract
Ifs is a mapping from the set of all convex bodies in Euclidean spaceE d toE d which is additive (in the sense of Minkowski), equivariant with respect to proper motions, and continuous, thens(K) is the Steiner point of the convex bodyK.
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Schneider, R. On steiner points of convex bodies. Israel J. Math. 9, 241–249 (1971). https://doi.org/10.1007/BF02771589
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DOI: https://doi.org/10.1007/BF02771589