Hi Jens, and others,

On Mar 7, 6:10 pm, Jens-Peer Kuska <k...@informatik.uni-leipzig.de>
wrote:
> Hi,
>
> X /: Dot[X, a : {0 ..}] := a
>
> will help.

Ah! TagSet, I get it; very useful. Mathematica is rather amazing. Its
syntax is more flexible than I can imagine, coming from another system & TeX.
Thanks all,

Will