[FRIAM] Can you guess the source.

[Frank Wimberly]

It seems to me that "sameSex" is reflexive on the set of all humans.
The only thing that would falsify that would be a human who is not the
same sex as him or her self.

Relexivity is a feature of an equivalence relation.  They are used in a
lot of theorems and, for instance, the output of a causal search (in the
context of statistical causal reasoning) is an equivalence class of
causal models.

On the other hand, some mathematicians might ask, "What has the world
got to do with it?"

Frank 

---
Frank C. Wimberly
140 Calle Ojo Feliz              (505) 995-8715 or (505) 670-9918 (cell)
Santa Fe, NM 87505           wimberly3 at earthlink.net

-----Original Message-----
From: friam-bounces at redfish.com [mailto:friam-bounces at redfish.com] On
Behalf Of Marcus G. Daniels
Sent: Sunday, April 15, 2007 10:33 AM
To: The Friday Morning Applied Complexity Coffee Group
Subject: Re: [FRIAM] Can you guess the source.

Frank Wimberly wrote:
> I am not aware of any definition of "discrimination power" in this
> context.
>   
For example, `sameSex' is not reflexive on the set of all humans.  It is

reflexive on the set of women or the set of men.
And the relation `sameSpecies' would be reflexive on the set of all 
humans.  The relation `sameSex' has more discrimination power than 
`sameSpecies'..

(It's not clear to me why I would want to organize the world into 
reflexive sets in the first place, other than to simplify things that 
are the same on certain dimensions.)

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