Maria Aparecida Soares Ruas (born 1948) is a Brazilian mathematician specializing in differential geometry and singularity theory.
[1][2] She became a teaching assistant at the same campus in 1971,[1] while at the same time studying for a master's degree at the University of São Paulo, working there with Gilberto Francisco Loibel; she completed her degree in 1974,[1][2] and was promoted to assistant professor.
[1] She defended her doctoral dissertation, Finity Determinacy and Applications at the University of São Paulo in 1983.
[1] She is a coauthor of the book Differential Geometry from a Singularity Theory Viewpoint (World Scientific, 2016, with Shyuichi Izumiya, Maria del Carmen Romero Fuster, and Farid Tari).
[4] Ruas is a member of the Brazilian Academy of Sciences, elected in 2008,[1][2] and in 2009 was named a commander in the National Order of Scientific Merit.