Search All of the Math Forum:

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

Notice: We are no longer accepting new posts, but the forums will continue to be readable.

Topic: What is a projection of an n-tuple?
Replies: 11   Last Post: Jan 26, 2013 11:52 AM

 Messages: [ Previous | Next ]
 FredJeffries@gmail.com Posts: 1,845 Registered: 11/29/07
Re: What is a projection of an n-tuple?
Posted: Jan 26, 2013 11:41 AM

On Jan 24, 12:12 pm, "Peter Percival" <peterxperci...@hotmail.com>
wrote:
> Writing <...> for an ordered n-tuple; is the second projection of <x,y,z>
> y or <y>?
>

The second projection is a function from
X x Y x Z -> Y
taking <x,y,z> |-> y
so the second projection of your particular triple <x,y,z> is y

http://en.wikipedia.org/wiki/Projection_%28set_theory%29

Date Subject Author
1/24/13 Peter Percival
1/24/13 Virgil
1/25/13 William Elliot
1/25/13 Dirk Van de moortel
1/25/13 Brian Q. Hutchings
1/26/13 Brian Q. Hutchings
1/26/13 Peter Percival
1/26/13 Brian Q. Hutchings
1/26/13 Mike Terry
1/26/13 FredJeffries@gmail.com