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

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FredJeffries@gmail.com

Posts: 1,098
Registered: 11/29/07
Re: What is a projection of an n-tuple?
Posted: Jan 26, 2013 11:41 AM
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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
http://books.google.com/books?id=x6cZBQ9qtgoC&pg=PA32



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