> > But my point that an empty vector is a pathological case
> remains valid.
> > An empty list, or an empty collection/set, however, is
> perfectly legitimate.
>
> There is nothing more pathological about an empty vector than any of
> the others.

I seem to recall that zero-dimensional vectors were considered something of
an oddity in my algebra classes, and I am pretty certain that I have never
used one, whereas I use empty lists and empty sets on a regular basis, but
maybe you are right.

Regards

Michael Burschik