Djairo Guedes de Figueiredo (academic signature: D. G. De Figueiredo, born on 2 April 1934, in Limoeiro do Norte) is a Brazilian mathematician noted for his researches on differential equations, elliptic operators, and calculus of variations.
[3] Figueiredo is a well-known figure among mathematicians in analysis and differential equations and among Brazilian students in physics, engineering and mathematics.
In 1995 he received the National Order of Scientific Merit[1] and in 2004 the title of "Doctor Honoris Causa" from the Federal University of Paraíba.
In 2011, he became the first Brazilian to receive a gold medal from the Telesio-Galilei Academy of Sciences "for his great contribution to Mathematics, especially to the theory of elliptical partial differential equations".
[4] He was a Ph.D. student of Louis Nirenberg at New York University,[5] and is currently a titular professor at UNICAMP, a position he began in 1988.