C. Saiago, jointly with C. Johnson published a book in the Cambridge University Press, Eigenvalues, Multiplicities and Graphs (Cambridge Tracts in Mathematics). This book gives a unified development of how the graph of a symmetric matrix influences the possible multiplicities of its eigenvalues.

A multidisciplinary team including mathematicians, ecologists and biologists, and coordinated by our Researcher Member Jorge Orestes Cerdeira, has proposed a mathematical method to understand and better explore the ecological niche of a species.