Abstract
The smooth structure of the net of principal lines near a closed one (principal cycle) is determined in terms of integral expressions evaluated on the cycle, involving the curvatures and their derivatives.
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Sotomayor, J., Garcia, R.A. Lines of curvature near principal cycles. Ann Glob Anal Geom 10, 275–289 (1992). https://doi.org/10.1007/BF00136870
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DOI: https://doi.org/10.1007/BF00136870