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Warrant: The Current Debate$
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Alvin Plantinga

Print publication date: 1993

Print ISBN-13: 9780195078626

Published to Oxford Scholarship Online: November 2003

DOI: 10.1093/0195078624.001.0001

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Bayesian Coherentism and Warrant

Bayesian Coherentism and Warrant

(p.114) 6 Bayesian Coherentism and Warrant
Warrant: The Current Debate

Alvin Plantinga (Contributor Webpage)

Oxford University Press

In this chapter, I outline the essentials of Bayesianism (also known as Bayesian Coherentism) and ask whether it contributes to a satisfying account of warrant. From the perspective of my overall project in Warrant: The Current Debate, Bayesianism can be seen as essentially suggesting conditions for a rational or reasonable set of partial beliefs, where a partial belief of an agent S is any belief that S accepts to some degree or another, no matter how small. Although Bayesians tend to speak not of warrant but of rationality, I consider in this chapter the relationship between Bayesianism and warrant. I conclude that the conditions for rationality proposed by Bayesians (e.g., coherence, strict coherence, changing belief by conditionalization or Jeffrey's “Probability Kinematics,” van Fraassen's Reflection) are neither severally necessary nor jointly sufficient conditions for warrant. Taken as a theory of warrant, Bayesianism is incomplete in that (1) it says nothing about the sort of relation between belief and experience required for warrant, and (2) it provides no account of evidence or evidential support.

Keywords:   Bayesianism, coherence, coherentism, conditionalization, van Fraassen, probability kinematics, warrant

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