Re: A question re measure

From: Russell Standish <r.standish.domain.name.hidden>
Date: Fri, 7 Oct 2005 14:33:15 +1000

On Wed, Oct 05, 2005 at 10:45:28AM -0400, Hal Ruhl wrote:
> I am not a mathematician and so ask the following:
>
> In my model the ensemble of descriptions [kernels in my All] gets
> populated by divisions of my list of fragments of descriptions into
> two sub lists via the process of definition.
>
> The list is assumed to be countably infinite.
>
> The cardinality of the resulting descriptions is c [a power set of a
> countably infinite set]
>
> Small descriptions describe simple worlds and large ones describe
> complex worlds.
>
> To me there should be far more highly asymmetric sized divisions
> [finite vs countably infinite] of the list than symmetric or nearly
> symmetric [countably infinite vs countably infinite] ones.
>
> However, for each small [finite] description there is a large
> [countably infinite] description.
>
> The result seems to be that there are more large descriptions than small
> ones.
>
> If the above is correct then mathematically what are the measures of
> the two types of descriptions?
>
> Hal Ruhl
>
>
>

A measure is a function m(x) on your set obeying additivity:

m(\empty)=0
m(A u B) = m(A) + m(B) - m(A^B)

where u and ^ are the usual union and intersection operations. The
range of m(x) is also often taken to be a positive real number.

Does this answer your question? Measure is generally speaking
unrelated to cardinality, which is what you're referring to with
finite, countable and uncountable sets.
 
Cheers

-- 
*PS: A number of people ask me about the attachment to my email, which
is of type "application/pgp-signature". Don't worry, it is not a
virus. It is an electronic signature, that may be used to verify this
email came from me if you have PGP or GPG installed. Otherwise, you
may safely ignore this attachment.
----------------------------------------------------------------------------
A/Prof Russell Standish                  Phone 8308 3119 (mobile)
Mathematics                         	       0425 253119 (")
UNSW SYDNEY 2052         	         R.Standish.domain.name.hidden             
Australia                                http://parallel.hpc.unsw.edu.au/rks
            International prefix  +612, Interstate prefix 02
----------------------------------------------------------------------------



Received on Fri Oct 07 2005 - 02:05:00 PDT

This archive was generated by hypermail 2.3.0 : Fri Feb 16 2018 - 13:20:11 PST