Re: terminology in definitions of limits

[Colin McLarty <colin.mclarty@case.edu>]

I often call them "test objects" in talking with students (by analogy
with "test particles" in General Relativity).  I don't think I have ever
done it in print.  But I did use "T" as the typical name of such an
object in my book.

I am curious to know what others think.

best, Colin

----- Original Message -----
From: categories@mta.ca
Date: Tuesday, January 20, 2009 11:01 am
Subject: categories: terminology in definitions of limits
To: categories@mta.ca

> Folk,
>
> Each definition of a limit which I've
> seen contains something I would describe
> as a "probe object" or "test object".  The
> definition of map object in L&S page 313
> for example, has X with a criterion asserted
> for every object X in the category.
>
> Is there any sense in my terminology?
>
> Thanks,        ... Peter E.
>
>
>
>