## Report on the ICHM-Co-Sponsored Meeting celebrating "Leonhard Euler's Tercentenary," São Paulo, Brazil
This meeting, co-sponsored by the ICHM, was hosted by the Brazilian Society for the History of Mathematics, in conjunction with the School of Arts, Sciences, and Humanities and the Institute of Mathematics and Statistics of the University of São Paulo in celebration of the three-hundredth birthday of the Swiss mathematician, Leonhard Euler. Its audience included undergraduate and graduate students as well as mathematicians and historians of mathematics.
The conference attendees
The program was comprised of the following speakers and their talks: ## "Euler and the Origin of Graph Theory"
This talk focused on Euler's solution of the Königsberg Bridge problem and on the concept of graphs and Eulerian trail. It also highlighted the related Hamiltonian circuit problem, its strikingly different computational complexity, and the famous "P = NP?" problem. ## Leonhard Euler's Most Popular Textbook and Its Repercussion in Brazil
The translation into Portuguese by Manuel Ferreira de Araújo Guimarães of Euler's ## Euler's "Recherches sur la courbure des surfaces" (1767) and the Evolution of the Qualitative Theory of the Differential Equations of Classical Geometry
Euler introduced the concept of normal curvature in 1767. This talk traced the presence and influence of this notion in the works of Monge, Dupin, Gauss, and Riemann as well as in the development of geometry and the qualitative theory of differential equations.
Prof. Wakabayashi (left) and Prof. Sotomayor (right) presenting their lectures.
## Euler's Recreational Mathematics
As is well-known, Euler wrote a number of key papers, explorative in nature, on number theory. This talk analyzed the relation between these number-theoretic works and Euler's recreational mathematics. ## Euler, a Multifaceted Mathematician
This lecture explored Euler's experimental side and examined the relationships between this characteristic of his nature and his intellectual path. It also touched on recent biographical publications on Euler. ## Some More Modern Aspects of Topology Related to the Euler Characteristic
The concept of the Euler characteristic served as the focal point of this talk. Among the questions explored were: how Euler's famous formula for polyhedra led to the notion of the Euler Characteristic. Some generalizations of this notion and some applications to the study of existence of vector fields on manifolds were also presented. ## Uses and Functions of "Elementa Doctrinae Solidorum" in the Field of Geometry
This lecture analyzed the different readings that the different disciplinary fields of geometry and topology have made of Euler's paper, "Elementa Doctrinae Solidorum." |