It is hard to imagine anyone taking exception to such a principle, so the issue is not joined until Boyd claims that we can only account for this principle’s leading to useful results “on a realistic understanding of the relevant collateral theories”: Suppose you always “guess” where theories are most likely to go wrong experimentally by asking where they are most likely to be false as accounts of causal relations, given the assumption that currently accepted laws represent probable causal knowledge. And suppose your guessing procedure works—that theories really are most likely to go wrong—to
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