On Aumann's theorem that the circle does not admit a mean
Acta Universitatis Carolinae. Mathematica et Physica, Tome 46 (2005) no. 2, pp. 77-82.

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Classification : 26E50, 54C15 
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     title = {On {Aumann's} theorem that the circle does not admit a mean},
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Trigos-Arrieta, F. Javier; Turzański, Marian. On Aumann's theorem that the circle does not admit a mean. Acta Universitatis Carolinae. Mathematica et Physica, Tome 46 (2005) no. 2, pp. 77-82. https://geodesic-test.mathdoc.fr/item/AUCMP_2005__46_2_a12/