Julio De Rizzo holds a PhD in theoretical philosophy from the University of Hamburg, Germany and currently teaches at the Pontifical Catholic University of Campinas, Brazil. He studied philosophy at the Pontifical Catholic University of São Paulo and the University of São Paulo, Brazil. His research interests focus on analytic metaphysics and the philosophy of logic.

• The formulation of the positivist thesis in ground-theoretic terms.- A definition of positivity and negativity.- The positive grounds of negative predications.- The positive basis of causally effective omissions.- The positive grounds of negative existential truths.