Notes
See, for instance, Pollock (Pollock 1987a, p. 35). Pollock emphasized defeasible reasons from the very beginning of his career. See his (1967), (1970) and his (1974), as well as the classics (1987a, b). I assume in what follows that reasons under discussion are all of equal strength. Nothing will turn on that assumption.
On p. 196. I have renamed the claims in the example. Pollock used the same form of words in the singly-authored first edition of the book.
p. 197.
(1987a): p. 486.
This is sloppy notation, of course, since I use "v" in two different ways: sometimes it appears as a variable for visual experience, other times as a name for the claim such experience exists.
Φ-BOS might be the claim that your belief in Φ is based on S, or the claim that your belief in Φ is likely to be based on S, or the claim that your belief in Φ has a high objective chance of being based on S is high, etc. Φ-BOS can be any claim belief in which amounts to a commitment to there being a strong link between source of information S and your belief in Φ.
References
Pollock, J. (1967). Criteria and our knowledge of the natural world. Philosophical Review, 76, 28–62.
Pollock, J. (1970). The structure of epistemic justification. American Philosophical Quarterly, 4, 62–78.
Pollock, John. (1974). Knowledge and Justification. Princeton: Princeton University Press.
Pollock, J. (1987a). Contemporary Theories of Knowledge. Second edition: Joe Cruz. New York: Rowman & Littlefield.
Pollock, J. (1987b). Defeasible reasons. Cognitive Science, 11, 481–518.
Pryor, J. (2000). The skeptic and the dogmatist. Nous, 34, 517–549.
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Sturgeon, S. Pollock on defeasible reasons. Philos Stud 169, 105–118 (2014). https://doi.org/10.1007/s11098-012-9891-x
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DOI: https://doi.org/10.1007/s11098-012-9891-x