Chapter Three. Ir-Content and the Set of Worlds Where a Sentence is True

  1. Frank Jackson

Published Online: 13 AUG 2010

DOI: 10.1002/9781444325362.ch3

Language, Names, and Information

Language, Names, and Information

How to Cite

Jackson, F. (2010) Ir-Content and the Set of Worlds Where a Sentence is True, in Language, Names, and Information, Wiley-Blackwell, Oxford, UK. doi: 10.1002/9781444325362.ch3

Publication History

  1. Published Online: 13 AUG 2010
  2. Published Print: 6 AUG 2010

ISBN Information

Print ISBN: 9781405161589

Online ISBN: 9781444325362



  • ir-content and set of worlds - where a sentence is true;
  • ir-content of “Some things are round” - set of worlds, where the sentence is true;
  • case of proper names;
  • The Adventures of Huckleberry Finn by Mark Twain” and “Samuel Clemens, author of The Adventures of Huckleberry Finn”;
  • two modes of presentation - corresponding to two different bearers of credence;
  • individuation issue distinction - from epistemological issues;
  • ‘within a world’ version of argument - using the difference principle;
  • sentences with “actually” and “actual” - as rigidification devices;
  • natural kind terms - sentences whose ir-content is not given by worlds at which they are true, but sentences with natural kind terms;
  • There is water nearby” - sentences, that we would expect to have a centered content


This chapter contains sections titled:

  • Preamble

  • The case of proper names

  • The difference principle

  • The ‘within a world’ version of the argument using the difference principle

  • Sentences containing “actual” and “actually”

  • Demonstrative adjectives

  • Natural kind terms

  • A passing comment on centering

  • Where to from here?