The thesis of the empirical underdetermination of theories (U-thesis) maintains that there are incompatible theories which are empirically equivalent. Whether this is an interesting thesis depends on how the term incompatible is understood. In this paper a structural explication is proposed. More precisely, the U-thesis is studied in the framework of the model theoretic or emantic approach according to which theories are not to be taken as linguistic entities, but rather as families of mathematical structures. Theories of similarity structures are (...) studied as a paradigmatic case. The structural approach further reveals that the U-thesis is related to problems of uniqueness in the representational theory of measurement, questions of geometric conventionalism, and problems of structural underdetermination in mathematics. (shrink)

In Historical Representation Frank Ankersmit seeks a juste milieu between postmodern theory and historical practice. But he still insists that the meaning of a historical representation “is not found, but made in and by [the] text.” Thus “there will be nothing, outside the text itself, that can govern or check [the conceptualization].” Accordingly, “a representation itself cannot be interpreted as one large description. I would not hesitate to say that this—and nothing else—is the central problem in the philosophy of history.” (...) On the other hand, he affirms that “a historical representation ‘is about’ a certain part of the past,” that historical debate is a “semantic quarrel not about the exact meaning of words, but about the past.” Everything hinges on how to grasp this idea of “aboutness.” I propose an alternative reading of post-positivist philosophy of science in hopes of reaching the juste milieu. The issue is whether colligatory concepts in history have a more radically constructed character than theoretical terms in natural-scientific theory, and whether, as with the latter, they can make intersubjective claims to warrant. My view is that colligatory concepts in historical representations can be conceived to refer in roughly the same way that theoretical terms do in natural-scientific theories. All the problems I find in Ankersmit’s approach come to the fore in his fruitful analogy to portrait painting. First, the personality the portrait evokes is not restricted to the representation, but is of the sitter. We are offered insight not into painting but into an actual character. That is, there is a cognitive, not simply an aesthetic, dimension to representation. Historical terms pick out something intersubjectively affirmable in reality, and discrimination is possible among rival versions. The question is how to regard—to explain and to evaluate—these underdetermined objects of consideration, not to preclude them by stipulation. (shrink)