Geodesic
Generalised Umbilics on Embedded Spheres
Canadian mathematical bulletin, Tome 34 (1991) no. 1, pp. 90-95

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DOI

We study two kinds of generalized umbilics on smoothly embedded n-manifolds in Rn+1. A sectional umbilic occurs where two of the principal curvatures are equal, and a split sectional umbilic is a more generalnotion.
DOI : 10.4153/CMB-1991-014-1
Mots-clés : 53A07, 53C40 
Noakes, J. L. Generalised Umbilics on Embedded Spheres. Canadian mathematical bulletin, Tome 34 (1991) no. 1, pp. 90-95. doi: 10.4153/CMB-1991-014-1
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     title = {Generalised {Umbilics} on {Embedded} {Spheres}},
     journal = {Canadian mathematical bulletin},
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     year = {1991},
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     number = {1},
     doi = {10.4153/CMB-1991-014-1},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1991-014-1/}
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