Jorge Sotomayor Tello


Jorge Manuel Sotomayor Tello was a Peruvian-born Brazilian mathematician who worked on differential equations, bifurcation theory, and differential equations of classical geometry.
He is one of five sons of Alfonso Sotomayor Ibarra, an accountant, and Clara Rosa Tello de Sotomayor. He was married to Marilda Antonia de Oliveira Sotomayor and had two children.
Sotomayor earned his Ph.D. from the IMPA in 1964 under the supervision of Maurício Peixoto at the age of 22.
In the dissertation Estabilidade Estrutural de Primeira Ordem e Variedades de Banach he presented a geometric reinterpretation and extension of the fruitful notions and results relating bifurcations and stability that were introduced by A. A. Andronov and E. A. Leontovich.
Sotomayor visited the University of California at Berkeley during 1966–1968.
He was a recipient of Brazil's National Order of Scientific Merit in mathematics. From 1994 until his death in early 2022, he was a member of the Brazilian Academy of Sciences. He also was a .
Sotomayor is the author of the textbooks Lições de Equações Diferenciais Ordinárias, IMPA, Projeto Euclides, , Singularidades de Aplicações Diferenciáveis, ELAM and Curvas Definidas por Equações Diferenciais no Plano, 13o Colóquio Brasileiro de Matemática, IMPA, . He also translated essays of Henri Poincaré into Portuguese, which were published in a book under the title Um Poeta, um Matemático e um Físico: Três Ensaios Biográficos por Henri Poincaré, EDUSP,.
He is also author of the books Lines of Curvature and Umbilical Points on Surfaces, 18o CBM, Publicações Matemáticas, IMPA, with Carlos Gutierrez, reprinted and updated as Structurally
Configurations of Lines of Curvature and Umbilic Points on Surfaces,
Lima, Monografias del IMCA, and Differential Equations of Classical Differential Geometry, a Qualitative Theory, 27o CBM, Publicações Matemáticas, IMPA, with Ronaldo Garcia.
Introduced, with Carlos Gutierrez, the concept of "principal configuration" of curvature lines on surfaces. See Structurally Stable Configurations of Lines of Principal Curvature", Astérisque, França, v. 98–99, p. 195–215,. The ideas leading to his work in this subject—traced back to the classical work of G. Monge, C. Dupin and G. Darboux—are discussed in his essay Monge's Ellipsoid. This research has been elaborared and extended in several directions by Sotomayor and his collaborators to include a large class of the differential equations of classical geometry and other classes of manifolds.

Death

He died on 7 January 2022, at the age of 79.

Selected publications

  • "with C. Gutiérrez: Structurally Stable Configurations of Lines of Principal Curvature", ''Astérisque, França, v. 98--99, p. 195--215,.''