Francisco Antonio Accioli Dória is Professor Emeritus at the Federal University of Rio de Janeiro (UFRJ), Brazil. PhD in Physics from the Brazilian Center for Physical Research (CBPF), Brazil. He is currently Collaborator Full Professor at COPPE-UFRJ. He was Senior Fulbright Scholar at Stanford University, and visiting researcher in the Mathematics Department at the University of Rochester, USA. He is a member of the Brazilian Academy of Philosophy (ABF). His areas of interest are mathematics, physics, computer science with emphasis in computational complexity, and mathematical economics.