Twardowski and Russel on non-existent entities, truth, and prediction. A comparative study

My aim in this paper is to offer a historical reconstruction of two alternative theories about truth and predication starting from the topic of non-existent entities. Following Brentano, Twardowski has developed, just as Husserl and Meinong did, a theory of intentionality based on the assumption that in a presentation the idea (the content) from the mind is related to its object by the so-called “intentional nexus” (this expression was proposed by Grossmann) without an ontological commitment regarding the existence of the object.