Summary
This paper is devoted to the study of the 2, fundamental form of a map, which generalizes this notion, well known for isometric immersions. We generalize results by Vilms, Yano, and Ishihara, and study in detail projective and umbilical maps.
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Nore, T. Second fundamental form of a map. Annali di Matematica pura ed applicata 146, 281–310 (1986). https://doi.org/10.1007/BF01762368
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DOI: https://doi.org/10.1007/BF01762368