Abstract
In this paper we provide a compact presentation of the verisimilitudinarian approach to scientific progress (VS, for short) and defend it against the sustained attack recently mounted by Alexander Bird (2007). Advocated by such authors as Ilkka Niiniluoto and Theo Kuipers, VS is the view that progress can be explained in terms of the increasing verisimilitude (or, equivalently, truthlikeness, or approximation to the truth) of scientific theories. According to Bird, VS overlooks the central issue of the appropriate grounding of scientific beliefs in the evidence, and it is therefore unable (a) to reconstruct in a satisfactory way some hypothetical cases of scientific progress, and (b) to provide an explanation of the aversion to falsity that characterizes scientific practice. We rebut both of these criticisms and argue that they reveal a misunderstanding of some key concepts underlying VS.
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Notes
A survey of the history of theories of verisimilitude is provided by Niiniluoto (1998). See also Oddie (2008) and, for a technical comparison of the main positions, Zwart (2001). For an introduction to VS in the context of a general discussion of different theories of scientific progress see Niiniluoto (2011a). Kuipers’ and Niiniluoto’s contributions to VS are discussed at length, respectively, in Festa et al. (2005a, b) and in Pihlström et al. (2007).
Rowbottom, however, seems to be one of them. In his rejoinder to Bird, he explicitly endorses (a qualified version of) S, according to which ‘science makes progress by discovering new truths’ and ‘excluding falsehoods’ (2010, p. 245). In any case, Rowbottom clearly distinguishes S and VS as different accounts of progress—a distinction that, on the contrary, Bird completely overlooks.
To continue the example above, if (p 1 & … & p n ) is ‘the truth’, then (p 1 & p 2), being logically stronger, is also more verisimilar than (p 1). However, it should be noted that, according to Oddie (1986), logically stronger true theories are not necessarily more verisimilar than weaker ones.
Of course, the HD-evaluation of the empirical merits of theories is complicated by a number of well-known factors, such as, for instance, the fact that the derivation of predictions from a theory requires the use of auxiliary hypotheses (2000, pp. 107–110).
According to Bird, ‘whether one prefers to couch [such an argument] in terms of accumulating truth or increasing verisimilitude is immaterial’ (2007, pp. 65–66); however, as we argue, the view of progress as increasing verisimilitude eschews Bird’s criticism.
Notice that, although Bird discusses sequences of true (or increasingly verisimilar) beliefs, his example is aimed at undermining S also when the case of only one true (or increasingly verisimilar) belief lacking appropriate grounding in the evidence is taken into account.
In this paper, we limited ourselves to a defence of VS against the criticisms raised by Bird. Nevertheless, it seems worth mentioning that Bird’s epistemic account of progress, which views progress as the accumulation of knowledge, suffers from a number of problems that VS eschews quite naturally. For instance, as forcefully argued by Rowbottom (2010), since an increase in knowledge requires an increase in true beliefs, it is difficult to see how the epistemic approach can account for progress in cases, such as the transition from Kepler’s to Newton’s theory, in which false theories replace false theories. On this, see also Niiniluoto (2011a, Sect. 3.5).
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Acknowledgments
We wish to thank Roberto Festa, Theo Kuipers, Ilkka Niiniluoto, and two anonymous referees for comments on earlier versions of this paper. Gustavo Cevolani acknowledges financial support from PRIN grant 2008 ‘Probability, stability, and invariance’. Luca Tambolo acknowledges financial support from PRIN grant 2008 ‘Probability, confirmation, and verisimilitude. The cognitive structures of “expert” opinion and decision in the empirical sciences and social interactions’.
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Cevolani, G., Tambolo, L. Progress as Approximation to the Truth: A Defence of the Verisimilitudinarian Approach. Erkenn 78, 921–935 (2013). https://doi.org/10.1007/s10670-012-9362-y
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DOI: https://doi.org/10.1007/s10670-012-9362-y