Reasons and Entailment

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    What is the relation between entailment and reasons for belief? In this paper, I discuss several answers to this question, and I argue that these answers all face problems. I then propose the following answer: for all propositions p 1,…,p n and q, if the conjunction of p 1,…, and p n entails q, then there is a reason against a person’s both believing that p 1,…, and that p n and believing the negation of q. I argue that this answer avoids the problems that the other answers to this question face, and that it does not face any other problems either. I end by showing what the relation between deductive logic, reasons for belief and reasoning is if this answer is correct.