The Workshop on Differential Geometry of the Institute of Mathematics of the Federal University of Alagoas has become a traditional event that takes place every year in Maceio-Alagoas, during the Brazilian summer. The aim of this workshop is to gather in Maceio national and international researchers of high scientific level in the field of differential geometry.

• Ezequiel Barbosa (Universidade Federal de Minas Gerais)
• Gérard Besson (Institut Fourier, Grenoble, France)
• Gregorio Pacelli Bessa (Universidade Federal do Ceará)
• Jaigyoung Choe (Korea Institute for Advanced Study, Korea) 
• Benoît Daniel (Université de Lorraine, France)
• Greg Galloway (University of Miami, US)
• Frederico Girão (Universidade Federal do Ceará)
• Laurent Hauswirth (Université de Marne-la-Vallée, France)
• Daniel Ketover (Princeton University, US)
• Patrícia Kruse Klaser (Universidade Federal do Rio Grande do Sul) 
• Levi Lima (Universidade Federal do Ceará)
• Jorge Herbert de Lira (Universidade Federal do Ceará)
• Marco Magliaro (Universidade Federal do Ceará)
• Ana Maria Menezes (Princeton University, US)
• Ivaldo Paz Nunes (Universidade Federal do Maranhão)
• Paolo Piccione (Universidade de São Paulo)
• Alvaro Ramos (Universidade Federal do Rio Grande do Sul)
• Harold Rosenberg (Instituto de Matemática Pura e Aplicada)
• Mariel Saez (Pontificia Universidad Católica de Chile)

Minicourse by Gérard Besson (Institut Fourier, Grenoble).  

Title: Horospherical rigidity of closed negatively curved manifold

Abstract: This is a joint work with Gilles Courtois and Sa'ar Hersonsky. The goal is to understand the proof of the theorem that assets that a closed negatively curved manifold which has one flat horosphere has constant curvature. The proof relies on an interplay between Geometry and Dynamical systems and this will be the opportunity to describe both of them for negative curvature. We will also place this research in a wider context.