Abstract

What does logic tells us how about we ought to reason? If P entails Q, and I believe P,should I believe Q? I will argue that we should embed the issue in an independentlymotivated contextualist semantics for ‘ought’, with parameters for a standard and set ofpropositions. With the contextualist machinery in hand, we can defend a strongprinciple expressing how agents ought to reason while accommodating conflictingintuitions. I then show how our judgments about blame and guidance can be handledby this machinery.

Highlights

  • What does logic tells us how about we ought to reason? If P entails Q, and you believe P, should you believe Q? There seem to be cases where you should not, for example, if you have evidence against Q, or the inference is not worth making

  • With the contextualist machinery in hand we can give a theory of when inferences should be made and when not

  • If we move from talk of belief to talk of inferences, and set the live possibilities parameter to the proposition that S rationally believes P1, P2...Pn, we can hold that the inference to Q is correct after all: Modified Strong Normativity Thesis For all agents S, and propositions P and Q: If P entails Q, and S believes P, S oughtA to infer Q

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Summary

Introduction

What does logic tells us how about we ought to reason? If P entails Q, and you believe P, should you believe Q? There seem to be cases where you should not, for example, if you have evidence against Q, or the inference is not worth making. What does logic tells us how about we ought to reason? We need a theory telling us when an inference ought to be made, and when not. With the contextualist machinery in hand we can give a theory of when inferences should be made and when not. 2) and argues that it can be solved by using the set of live possibilities, as can the preface paradox

Background
Two parameters
Standard
Objection from belief revision
The preface paradox
Excessive demands
Clutter avoidance
Ideals
Guidance
Appraisal
Conclusion
Full Text
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