Show Summary Details

p. 11. Validity: what follows from what?locked

  • Graham Priest

Abstract

To tell someone that they are not being logical is seen as a criticism. Logic is the study of what counts as a good reason for what, and why. ‘Validity: what follows from what?’ explains how logic works in terms of premisses, inferences, conclusions, and validity of premisses. A valid inference is one where the conclusion follows from the premiss or premisses. A deductively valid inference is one for which there is no situation in which all the premisses are true, but the conclusion is not. How do we recognize inferences as valid or invalid? Is there some special insight contained within us or is it hard-wired into us through evolution?

Access to the complete content on Very Short Introductions online requires a subscription or purchase. Public users are able to search the site and view the abstracts and keywords for each book and chapter without a subscription.

Please subscribe or login to access full text content.

If you have purchased a print title that contains an access token, please see the token for information about how to register your code.

For questions on access or troubleshooting, please check our FAQs, and if you can't find the answer there, please contact us.