It is not well known that Moritz Schlick, whose name is inseparable from the development of logical positivism, was extremely critical of positivism prior to the 1920’s. The positivism Schlick found fault with was associated with the physicist Ernst Mach. Schlick went to considerable lengths to criticize Machian positivism on both epistemological and ontological grounds. He also objected to the positivist claim to be able to account for relativity theory within its framework.Schlick’s views before his move to Vienna in 1922 (...) have been labeled a “critical empiricist realism” (see Feigl 1938, p. xx) or a “structural realism” (Friedman 1983, p. 501). His exposure to the work of Ludwig Wittgenstein is generally held up as the crucial factor in turning him away from his early realist views towards positivism. There is general acknowledgment of a major change in Schlick’s philosophical thinking in the early 20’s; disagreement exists, however, over both the extent of the change and whether it was a positive or negative one. (shrink)

The aim of this paper is to show that a comprehensive account of the role of representations in science should reconsider some neglected theses of the classical philosophy of science proposed in the first decades of the 20th century. More precisely, it is argued that the accounts of Helmholtz and Hertz may be taken as prototypes of representational accounts in which structure preservation plays an essential role. Following Reichenbach, structure-preserving representations provide a useful device for formulating an up-to-date version of (...) a (relativized) Kantian a priori. An essential feature of modern scientific representations is their mathematical character. That is, representations can be conceived as (partially) structure-preserving maps or functions. This observation suggests an interesting but neglected perspective on the history and philosophy of this concept, namely, that structure-preserving representations are closely related to a priori elements of scientific knowledge. Reichenbach’s early theory of a relativized constitutive but non-apodictic a priori component of scientific knowledge provides a further elaboration of Kantian aspects of scientific representation. To cope with the dynamic aspects of the evolution of scientific knowledge, Cassirer proposed a re-interpretation of the concept of representation that conceived of a particular representation as only one phase in a continuous process determined by pragmatic considerations. Pragmatic aspects of representations are further elaborated in the classical account of C.I. Lewis and the more modern of Hasok Chang. (shrink)