Drexel dragonThe Math ForumDonate to the Math Forum


Math Forum
 Ask Dr. Math
 Discussions
 Internet Newsletter
 MathTools
 Problems of the Week
 Teacher2Teacher
 Teacher Exchange
 Workshops

Search All of the Math Forum:
Browse our Internet Mathematics Library

Views expressed in these public forums are not endorsed by Drexel University or The Math Forum.


Math Forum » Discussions » sci.math.* » sci.math.independent

Topic: A formal counter-example of Ax Ey P(x,y) -> Ey Ax P(x,y)
Replies: 2   Last Post: Dec 12, 2012 11:53 AM

Advanced Search
Reply to this Topic Reply to this Topic

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
Aatu Koskensilta

Posts: 2,579
Registered: 6/28/08
Re: A formal counter-example of Ax Ey P(x,y) -> Ey Ax P(x,y)
Posted: Dec 12, 2012 11:22 AM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

Dan Christensen <Dan_Christensen@sympatico.ca> writes:

> This problem is central to predicate calculus.

What problem is that? There is no apparent problem in the observation
that (x)(Ey)P(x,y) does not imply (Ey)(x)P(x,y).

--
Aatu Koskensilta (aatu.koskensilta@uta.fi)

"Wovon man nicht sprechen kann, darüber muss man schweigen"
- Ludwig Wittgenstein, Tractatus Logico-Philosophicus

Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© Drexel University 1994-2013. All Rights Reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.