Bernard Bolzano and the Brentano school

The article defines the significance of Bolzano for the Brentano school and explores the sense in which Bolzano could have been an intermediary between late Scholasticism and the Brentano school. The first part of the article discusses the assessment of the Bolzano’s philosophical doctrine, which is offered by Brentano himself and his closest student Marty. Brentano found Bolzano’s pursuit of scientific philosophy commendable, but at the same time criticized him for platonism in the theory of meanings and for distin­guishing the ways of being. Marty, continuing partly to criticize Bolzano, rather posi­tively assessed his doctrine of propositions in themselves. Using the example of the doc­trine of modifying adjectives, it is shown what influence Bolzano had on Marty’s philoso­phy of language. In the second part of the article, the question of Bolzano’s influence on K. Twardowski, A. Meinong and E. Husserl is considered. It is shown that each of these thinkers interpreted Bolzano's doctrine of propositions in themselves in different ways and at the same time not quite correctly. Bolzano’s doctrine of proposition structure is discussed separately and the evaluation of this doctrine proposed by Husserl is analyzed. Bolzano’s insufficient attention to the syntactic complexity of sentences, according to Husserl, was the reason that the Bohemian thinker did not propose a full-fledged theory of meaning and did not investigate the relationship between semantics and ontology. For other students of Brentano, Husserl’s assessment only confirmed that Bolzano did not pay due attention to linguistic synsemantics. The third part answers the question of Bolzano’s mediation between late Scholasticism and the Brentano school: the desire to defend the objectivity of truth and refute subjectivism unites such thinkers as S. Izquierdo and B. Bolzano, and it is on this basis that the continuity between late Scholasticism and the Brentano school can be traced.