Show Summary Details

p. 72. Truth functions—or not?locked

  • Graham Priest

Abstract

We are strongly intuitive about the validity of various inferences. This may or may not be hard-wired into us. Intuition gets us into trouble sometimes. ‘Truth functions—or not?’ plays around with the idea of invalid and valid inferences and, using phrases such as ‘or’ or ‘it is not the case that’, shows that chaining valid inferences together doesn’t necessarily result in an invalid inference. People’s intuition can be misleading. Sentences can be true or false. Gottlob Frege called these truth values. If we assume that every sentence is either true or false, but not both, we can predict the conditions in what logicians call a truth table.

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.