Fons Dewulf

Wittgenstein & logical empiricism Rudolf Carnap and Ludwig Wittgenstein share many philosophical interests: an admiration of Frege’s formal logic, an anti-metaphysical stance and a modernist aesthetic aimed at removing superficial elements from discourse or thought. Despite their shared interests, Carnap and Wittgenstein ended their interaction in a plagiarism dispute. In this essay, I discuss which metaphilosophical reasons lie behind their dispute. I argue that Wittgenstein’s overarching philosophical project stood in direct conflict with Carnap’s. First, Wittgenstein never accepted that there are meaningful sentences about the language of science. Thus, there could be no meaningful reflection on science, and this nullified Carnap’s Logic of Science project. Second, Wittgenstein had an overall disdain for Carnap’s desire, as displayed in the Manifesto and the Aufbau, to reform philosophical activity as a part of science itself in tandem with a general reform of the place science in society.

I argue that Carl Hempel’s pioneering work on scientific explanation introduced an assumption that Hempel never motivated, namely, that explanation is an aim of science. Ever since, it has remained largely unquestioned in analytic philosophy of science. By expanding the historical scope of the debate on explanation to philosophers from the first half of the twentieth century, I show that the debate should include a critical reflection on Hempel’s assumption. This reflection includes two problems: how to motivate one’s position on the aims of scientific knowledge and how to decide which examples count as expressions of those aims.

In this paper I trace Ernest Nagel’s earliest ideas on explanation by investigating his course-notes of the 1930s. At Columbia University there was an increasing interest in the study of Aristotle. As I show, Nagel’s focus on the explanatory aim of science originated from his reading of Aristotle’s Posterior Analytics. Through his teaching of Aristotle, Nagel inspired his New York colleagues to focus on a philosophical analysis of explanation. I claim that this resulted in Carl Hempel’s earliest work on scientific explanation. Although scientific explanation was not a central topic for philosophers of science in the 1940s or 1950s, Hempel and Nagel’s interest in the topic helped to canonize it in a period when the topics and methods in philosophy of science became increasingly standardized.

In this paper I argue that Carnap in the Aufbau and in his later writings consistently conceives the humanities and the social sciences as domains of knowledge that are epistemically equal to the natural sciences. I show that Carnap was skeptical about the philosophical theories of Dilthey, Rickert and Windelband which aimed to distinguish the natural sciences from the humanities through a logical criterion. Although Carnap in the Aufbau integrated some terminology from Dilthey, Windelband and Rickert, he never accepted their philosophical questions about the humanities as legitimate. In his later writings, following Otto Neurath, he openly distanced himself from terminology that could be associated with such questions, and he never again spoke in a programmatic fashion about cultural concepts, like he had done in the Aufbau.

In this paper, we investigate how the life and work of Louis Rougier relate to the broader political dimension of logical empiricist philosophy. We focus on three practical projects of Rougier in the 1930s and 1940s: first, his attempts to integrate French-speaking philosophers into an international network of scientific philosophers by organizing two Unity of Science conferences in Paris; second, his role in the renewal of liberalism through the organization of the Walter Lippmann Colloquium; and third, his attempts at political negotiations between Great Britain and the Vichy regime during the Second World War. These activities of Rougier in the 1930s and 1940s have so far never been discussed as part of a unified project on his part. Based on our investigations of these practical projects of Rougier, we argue that his relation to logical empiricist philosophers should primarily be understood on the level of action. His projects aimed to proliferate the concrete improvement of society and the lives of its citizens by expunging all metaphysical questions and speculations from the sphere of social discourse. Rougier conceived logical empiricist philosophers as allies to achieve such practical effects in society.

In this paper, I criticize the thesis that value-laden approaches in American philosophy of science were marginalized in the 1960s through the editorial policy at Philosophy of Science and funding practices at the National Science Foundation. I argue that there is no available evidence of any normative restriction on philosophy of science as a domain of inquiry which excluded research on the relation between science and society. Instead, I claim that the absence of any exemplary, professional philosopher who discussed the relation between science and society sufficed to narrow the focus of philosophers of science, given the institutional stabilization of the domain within professional philosophy from 1959 onwards.

In this paper I investigate how intellectual problems concerning an epistemology of history and a historical view of knowledge played a role in the network of logical empiricist philosophers between 1930 and 1945. Specifically, I focus on the practical efforts of Hans Reichenbach and Otto Neurath to incorporate these intellectual stakes concerning history. I argue that Reichenbach was mainly concerned with creating more institutional space for scientific philosophy. Consequently, he was interested in determining his relation to historically oriented philosophy on the practical level only. Otto Neurath, I claim, was interested in promoting an intellectual incorporation of an epistemology of history and a historical view of knowledge into the Unity of Science movement. His attempts, however, largely failed. I conclude that the intellectual stakes concerning history did have an effect within the network of logical empiricist philosophers, but that, by 1945 these stakes were entirely dissolved. The displacement of the network to the United States removed Reichenbach’s practical problems, while Neurath was unable to persuade enough actors before his death.

This paper situates Carl Hempel's 1942 paper "The Function of General Laws in History" within a broader debate over the philosophy of history in American academia between 1935 and 1943. I argue that Hempel's paper was directed against German neo-Kantianism, and show how the German debate over historiography continued between 1939 and 1943 in the context of New York through the contributions of German philosophers who operated in the same intellectual network as Hempel, namely Paul Oskar Kristeller and Edgar Zilsel. Whereas this debate still witnessed many different philosophical approaches, Hempel's logico-analytic methodology would come to dominate analytic philosophy of history.

This article investigates the various ways in which Rudolf Carnap incorporated contemporary epistemological problems concerning the Geisteswissenschaften in Der logische Aufbau der Welt. I argue that Carnap defends a nonreductive incorporation of the Geisteswissenschaften within the unity of science. To this end Carnap aims to solve the problem of individuality, which was the focus of attention for important philosophers of the Geisteswissenschaften such as Wilhelm Dilthey, Heinrich Rickert, and Wilhelm Windelband. At the same time, Carnap argues that his constitutional method, which transforms cultural objects into psychological or physical objects, does not imply a loss of autonomy for the Geisteswissenschaften. Besides this defense of autonomy, Carnap incorporates several central notions of the contemporary theory of the Geisteswissenschaften into his theory of the Aufbau: cultural manifestation, the phenomenology of cultural experience, and the method of Verstehen.