ABSTRACT
Stefania Centrone’s book Studien zu Bolzano, published in 2015, is a collection of six German written articles dealing mostly with Bolzano’s logic and previously published in several journals. The number of texts is expanded to seven by a new study on Bolzano’s concept of logical consequence. Bolzano’s Contributions are discussed in the first essay right from the beginning. For Bolzano, the proper method of mathematics is the method of proper scientific treatment of all objective regions. However, there are ambivalences, weaker points. Centrone points out that Bolzano’s logic is not able to satisfy the principles according to which consequences should be founded in their grounds. Bolzano states the principles mentioned earlier only after he attempts to prove that there are first grounding propositions which necessarily have simple concepts as subjects and predicates. Centrone points out that Bolzano considers “clearness” as an internal property of the ideas, while for Leibniz, it consists of a relation between an idea and its object.
