Carnap and Quine on evidence

Peter Hylton has a paper in the Monist, now a few years old, that I’ve been meaning to comment on because it exemplifies a bad habit much of the Carnap-Quine literature suffers from: comparing the early Carnap with the later Quine. This is tempting, of course, because Quine himself did it (as e.g. Gregory Lavers has pointed out), and even Burton Dreben (Peter’s doctoral supervisor), though far more scrupulous than Quine, tended to fall into it; I guess it became a sort of Harvard thing, and Peter can’t be blamed too much for slipping into the ruts of his elders. However, he happens to have chosen a subject where this mismatch gets him into serious trouble, since if he’d actually compared the mature Quine with the mature Carnap, his main points wouldn’t be just questionable, they’d have collapsed entirely.

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Yet another friendly suggestion for Ladyman and Ross (with an aside on Quine)

I hope I’ve made clear in my previous posts about Ladyman and Ross and their wonderful book All Things Must Go (here and here) that my critical remarks about them are to be understood as supportive and constructive.  I’m trying to buttress their position and make it stronger.  I’m on their side, as are certain other sympathetic critics, who have pointed out other problems with their approach, not directly related to what I’ve said in those previous posts.  Of particular importance, I think, is the critique by Kyle Stanford in a 2010 symposium on the Ladyman-Ross book in Metascience. Stanford points out that the concept of “structure” central to Ladyman-Ross’s structural realism serves several distinct purposes in their book: it is what remains continuous through theoretical transitions, for instance, and is also what explains the novel predictive successes of those theories. Stanford doubts whether a single concept of “structure” can do all these jobs. Continue reading