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Preparation of Ethers by Alcohol Dehydration
In this method, in the presence of protic acids, alcohol dehydrates to produce alkenes and ethers under different conditions. For example, in the presence of sulphuric acid, dehydration of ethanol at 413 K yields ethoxyethane, whereas it yields ethene at 443 K.
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Williamson on Counterpossibles.

Francesco Berto1, Rohan French2, Graham Priest3

  • 11Institute for Logic, Language and Computation (ILLC), University of Amsterdam, Amsterdam, Netherlands.

Journal of Philosophical Logic
|April 19, 2019
PubMed
Summary
This summary is machine-generated.

This paper defends the common sense view that some counterpossible conditionals are true and some false. It refutes philosopher Timothy Williamson

Keywords:
Counterfactual modal epistemologyCounterpossible conditionalsImpossible worldsNonvacuism

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Area of Science:

  • Philosophy of Logic
  • Modal Logic
  • Metaphysics

Background:

  • Counterpossible conditionals involve impossible antecedents, challenging standard conditional logic.
  • Common sense suggests varying truth values for counterpossible conditionals.
  • Philosopher Timothy Williamson argues all counterpossible conditionals are true, contrary to intuition.

Purpose of the Study:

  • To defend the common sense view on the truth values of counterpossible conditionals.
  • To counter Timothy Williamson's recent arguments that all counterpossible conditionals are true.
  • To explore the logical and metaphysical implications of impossible antecedents in conditionals.

Main Methods:

  • Analysis of logical structures of counterpossible conditionals.
  • Examination of philosophical arguments concerning impossible worlds and counterpossibles.
  • Critique of Timothy Williamson's objections to the common sense view.

Main Results:

  • The paper presents arguments supporting the common sense intuition that some counterpossible conditionals are true and others false.
  • Objections are raised against Timothy Williamson's thesis, demonstrating its counterintuitive consequences.
  • A framework is implicitly suggested for distinguishing between different types of counterpossible conditionals based on their truth conditions.

Conclusions:

  • The common sense view regarding the truth of counterpossible conditionals is defensible against contemporary philosophical challenges.
  • Williamson's universal truth claim for counterpossibles is shown to be problematic.
  • Further research into the semantics and logic of counterpossible reasoning is warranted.