Help with sets

Fri Oct 15 00:22:25 EDT 2010

In message 
<12fcd67a-774d-42f0-851a-9c3497df9d04 at s24g2000pri.googlegroups.com>, Steve 
Howell wrote:

> On Oct 14, 4:09 pm, Gregory Ewing <greg.ew... at canterbury.ac.nz> wrote:
>> Steve Howell wrote:
>>
>> Maybe "analogy" or "similarity" would be a better word here.
> 
> Agreed.  "Analogy" seems particularly appropriate.

Except that, while analogies can be handy for illustrating things, they are 
useless for actually supporting arguments.