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# Antipodal Points and Diameter of a Sphere

2018, Vol. 14, no. 4, pp.  579-581

Author(s): Podobryaev A.

We give an example of a Riemannian manifold homeomorphic to a sphere such that its diameter cannot be realized as a distance between antipodal points. We consider a Berger sphere, i.e., a three-dimensional sphere with Riemannian metric that is compressed along the fibers of the Hopf fibration. We give a condition for a Berger sphere to have the desired property. We use our previous results on a cut locus of Berger spheres obtained by the method from geometric control theory.
Keywords: diameter, $SU_2$, Berger sphere, antipodal points, cut locus, geometric control theory
Citation: Podobryaev A., Antipodal Points and Diameter of a Sphere, Rus. J. Nonlin. Dyn., 2018, Vol. 14, no. 4, pp.  579-581
DOI:10.20537/nd180410