Abstract
This evocative essay focuses on some landmarks that led the author to the study of principal curvature configurations on surfaces in \({\mathbb{R}}^3\), their structural stability and generic properties. The starting point was an encounter with the book of D. Struik and the reading of the references to the works of Euler, Monge and Darboux found there. The concatenation of these references with the work of Peixoto, 1962, on differential equations on surfaces, was a crucial second step. The circumstances of the convergence toward the theorems of Gutiérrez and Sotomayor, 1982–1983, are recounted here. These theorems are pointed out as the first encounter between the line of thought disclosed from the works of Monge, 1796, Dupin, 1815, and Darboux, 1896, with that transpiring and evolving from the achievements of Poincaré, 1881, Andronov–Pontrjagin, 1937, and Peixoto, 1962. Some mathematical developments as well as open problems sprouting from the 1982–1983 works are mentioned on Sect. 10.
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National Institute of Pure and Applied Mathematics.
The biography of C. Carathéodory by the historian Maria Georgiadou, Springer, 2004, suggests that she had elucidated the origin of this conjecture. However, the reference given leads to a work on umbilic points unrelated to the conjecture-problem 6.
Presently the restaurant “Le Marrakech” operates in the building that hosted the hotel at 20, rue Monge. See https://www.yelp.com/biz/le-marrakech-dijon-2 and https://www.yelp.com/biz/hotel-monge-dijon.
This example of 1991 has only one of the principal foliations with dense curves. In R. Garcia and J. Sotomayor, Tori embedded in \({\mathbb{R}}^3\) with dense principal lines. Bull. Sci. Math., 133:4 (2009), 348-354, was given an example in which both principal foliations have its lines dense.
Acknowledgements
The author is grateful to M. O. Sotomayor, C. P. Moromisato, F. E. Wolter and L. F. Mello for helpful style suggestions on a previous version and to R. A. Garcia for his mathematical comments and substantial aid in the production of the pictures in this work.
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Communicated by Marco Antonio Teixeira.
To the memory of Maurício M. Peixoto (1921–2019), Carlos E. Harle (1937–2020), Carlos T. Gutiérrez (1944–2008) and Daniel B. Henry (1945–2002).
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The author is a fellow of CNPq, Grant: PQ-SR-307690/2016-4.
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Sotomayor, J. An encounter of classical differential geometry with dynamical systems in the realm of structural stability of principal curvature configurations. São Paulo J. Math. Sci. 16, 256–279 (2022). https://doi.org/10.1007/s40863-021-00231-6
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DOI: https://doi.org/10.1007/s40863-021-00231-6