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Svoboda, Karel
On characterization of the sphere in $E^4$ by means of the parallelness of certain vector fields. (English). Časopis pro pěstování matematiky, vol. 105 (1980), issue 1, pp. 56-72
MSC: 53A05 | MR 560758 | Zbl 0435.53004 | DOI: 10.21136/CPM.1980.118047
References:
[1] A. Švec: Contributions to the global differential geometry of surfaces. Rozpravy ČSAV 87, 1, 1977, 1-94. MR 0467608
[2] A. Švec: On orthogonal conjugate nets in $E^4$. Comm. mat. Univ. Car. I6, 1 1975, 183-187. MR 0365372
[3] K. Svoboda: Some global characterizations of the sphere in $E^4$. Čas. pro pěst. matem. 4, 103(1978) 391-399. MR 0512236
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