Edgar de Oliveira da Fonseca is a Brazilian mathematician known for his contributions to the field of mathematics, particularly in the areas of algebra and geometry. He has published several research papers and has been involved in various academic activities, including teaching and mentoring students. In addition to his research, da Fonseca has participated in international conferences and collaborated with other mathematicians. His work has helped advance the understanding of mathematical concepts and has inspired many in the academic community. He is recognized for his dedication to education and the promotion of mathematics in Brazil.