Soru

Philosophers of science have long grappled with the tension between the "no-miracles" argument—which asserts that the predictive success of scientific theories would be an inexplicable coincidence if they were not at least approximately true—and the "pessimistic meta-induction," which notes that historically successful theories, such as those positing phlogiston or the luminiferous ether, have repeatedly been discarded as fundamentally false. Attempting to reconcile these opposing intuitions, John Worrall proposed Epistemic Structural Realism (ESR). Worrall argues that while the ontological claims of discarded theories regarding the fundamental nature of reality are indeed abandoned, their mathematical structures are frequently retained by successor theories. To substantiate this, Worrall invokes the transition from Augustin-Jean Fresnel’s wave theory of light, which posited an elastic solid ether as the medium for light propagation, to James Clerk Maxwell’s electromagnetic theory. Although Maxwell discarded the ether entirely, he preserved Fresnel's equations. For Worrall, this continuity indicates that epistemic commitment should be restricted to the structural content of our best scientific theories rather than their assertions about unobservable entities.

Critics like Bas van Fraassen, however, argue that ESR collapses into either traditional scientific realism or mere instrumentalism, asserting that it is conceptually incoherent to cleanly abstract a theory's mathematical structure from its ontological commitments. From this perspective, the terms within Fresnel's equations derive their semantic content explicitly from the hypothesized ether, rendering their preservation in Maxwell’s theory merely a fortuitous formal overlap rather than an epistemic vindication of structural truth.

Which of the following best describes the primary function of the author's discussion of Fresnel's equations in the passage?