Svoboda, Karel On characterization of the sphere in \(E^4\) by means of the parallelness of certain vector fields. (English) Zbl 0435.53004 Cas. Pěst. Mat. 105, 56-72 (1980). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page MSC: 53A05 Surfaces in Euclidean and related spaces Keywords:surface; parallel normal vector field; orthogonal conjugate net of lines; sphere Citations:Zbl 0402.53001 × Cite Format Result Cite Review PDF Full Text: DOI EuDML