Djairo Guedes de Figueiredo,** **Brazilian mathematician** **(Limoeiro do Norte, Ceará State 02
April 1934 –

Authored 93
papers and 4 books

With F.E.
Browder introduced the term π1-space (1965)

Stated and
proved a fixed point theorem for weakly continuous maps in Banach spaces (1966)

With E.
Mitidieri obtained some sufficient conditions for validity of the maximum
principle for cooperative and non-cooperative elliptic system (1991)

Defined the
notion of G operator

With M.
Cuesta & J.P. Gossez proved the existence of a first non-trivial curve in
the Fucik spectrum of the p-Laplacian (1998)

With J.
Yang proved a priori bound for positive solutions of semilinear elliptic
systems with nonlinearities depending on the gradients (2001)

With J.P.
Gossez & P. Ubilla, introduced notions of local superlinearity and local sublinearity
in J. Func.Anal. 199(2):452-67, 2003

With B. Ruf
& J.M. do O extended the notion of critical growth to superlinear
nonlinearities which don’t have a polynomial growth (2005)

With B.
Sirakov showed that a class of nonlinear elliptic systems have the property
that all their positive classical solutions are uniformly bounded (2005)

With B. Ruf
& J.M. do O proved the existence of positive solutions for non-variational
elliptic systems in dimension two (2008)

With E.M.
Santos & O.H. Miyagaki obtained new Hardy type inequalities and proved
sharp pointwise estimates for functions in the Sobolev spaces of radial
functions defined in a ball (2011)

**HONOURS **

Telesio
Galilei Gold Medal 2011

Full Professor,
Illinois University (1967-73)

Associate
Researcher, University of Chicago (1966-7)