Encyclopedia > Transitivity of identity

  Article Content

Transitivity of identity

The transitivity of identity is the logical principle that, if A = B, and B = C, then A = C.

For example, if you know that the Morning Star is the same thing as the Evening Star[?], and you know that the Evening Star is Venus, you can conclude that the Morning Star is Venus.

The transitivity of identity (like rules concerning identity generally) is not always valid in epistemological or modal contexts. For example, if Oedipus knows that his wife is Jocasta, and you know that Jocasta is the mother of Oedipus, you may not conclude that Oedipus knows that his wife is his mother.

See also: transitivity, identity



All Wikipedia text is available under the terms of the GNU Free Documentation License

 
  Search Encyclopedia

Search over one million articles, find something about almost anything!
 
 
  
  Featured Article
1904

... poet August 28 - Secondo Campini, Italian jet pioneer November 30 - Clyfford Still, painter Deaths: January 20 - Dmitri Ivanovich Mendeleev, Russian chemist and ...

 
 
 
This page was created in 24.8 ms