On Tuesday, August 13, 2002, at 10:08 AM, Tim May wrote:
> This graph, this set of vertices and edges, is a "per-ordered" set.
> More than just a set, any category with the property that between any
> two objects "p" and "q" there is AT MOST one arrow "p --> q" is said to
> be "pre-ordered."

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I meant to type "pre-ordered" in the first line above.
I don't normally worry overmuch about minor typos, especially when I
used the correct spelling right after the typo, but I wouldn't want
anyone thinking there's some kind of "per-ordered" set!
--Tim May