cohomogeneity
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Hsiang-Lawson's conjecture — In mathematics, Hsiang Lawson s conjecture states that the Clifford torus is the only minimally embedded torus in the 3 sphere S³.References*W. Y. Hsiang and H.B. Lawson, Minimal submanifolds of low cohomogeneity , Jour. of Diff. Geom., 5 (1971)… … Wikipedia