Abstract

Empiricism and Semantics: From Rudolf Carnap to Contemporary Epistemology In recent years analytic philosophy has developed a deeper interest in the historiographical reconstruction of its roots. This interest is testified by many publications, which have appeared since the 90’s, about the life and thought of classical authors of analytic tradition, like Frege, Russell, Wittgenstein, Carnap and Tarski. In my doctoral thesis I take up this line, focusing on two famous works of Rudolf Carnap: Der logische Aufbau der Welt, published in 1928, and Logische Syntax der Sprache, published in 1934. The main reference points of my historical and philosophical research are Jorge Alberto Coffa and Michael Friedman: I try to imitate their style of combining the analysis of technical aspects of logic and philosophy of language with broader considerations about conceptual trends and theoretical contexts. In the first chapter I present Carnap’s attempt in 1928 to build a symbolic system that formalizes scientific concepts. With this technique of formalization Carnap aims for the reduction of science to subjective experiences. The Aufbau can be seen as a programmatic manifesto of a verificationist theory of meaning, belonging to the empiricist tradition – as Quine indicated in his famous critic. Nevertheless, in the book there are strong influences of the Neokantian school, which link Carnap’s thought to 19th century transcendental philosophy. In the chapter, I highlight the points of the Aufbau in which a “transcendental scheme” can be identified; particularly, the concept of structure, that plays an important role in Carnap’s arguments, shows a kinship with the Kantian tradition. In addition, I emphasize the problematic status of solipsism in the carnapian system. The second chapter begins with a summary of the Protocol Sentence Debate among the members of the Vienna Circle in the early 30’s. Discussing the function of protocol sentences in the epistemology of logical empiricism, one has to deal with the task of explaining the syntactical relation that the authors had in mind, when they were disputing the foundation of theoretical sentences through the protocols. With regard to this subject, I start to analyze Logische Syntax der Sprache, whose main goal is to define the concept of consequence, a syntactical/semantic relation broader than that determined by the usual rules of derivation in axiomatic systems. Coping with this problem, Carnap develops some technical devices that are pretty close to Tarski’s definition of truth. The chapter finishes with a brief survey of the significance of tarskian semantics for contemporary philosophy of science. The third chapter consists of the synthetic exposition of an original approach to the problems of formalization and semantics, developed in the 60’s and 70’s by Paul Lorenzen and his scholars. The Erlangen School of epistemological constructivism is here considered because it doesn’t assume the standard opposition between syntax and semantics, the conceptual cornerstone of Carnap’s and Tarski’s analysis of scientific theories. Lorenzen’s approach emphasizes the instrumental and operational elements of the scientific practice; at the same time, he advocates a conception of language in which pragmatics plays a prominent role, encompassing the syntactical and the semantic dimension