Retired as Full Professor of the Department of Mathematics, Federal University of Paraná, Curitiba, PR – Brazil.
From 1978 to 1991, I taught at the Department of Mathematics of the Federal Center of Technological Education of Paraná (CEFET/PR), in Curitiba, PR, Brazil. (today, the Technological Federal University of Paraná).
In 1978, I also have taught mathematics at the Faculty of Economy and Administration (FAE) in Curitiba, and in 1986, at the Pontifical Catholic University of Paraná.
Before my university period, I taught physics, mathematics, and geometric drawing in elementary schools.
Department of Philosophy, University of Florence, Italy (1992/1993)
School of Philosophy, University of Leeds, UK (1995/1996)
Wolfson College, Oxford University, UK (2008)