Thank you for your kind responses. Yes indeed, now I remember Jim Lambek talking about multicategories (Boulder'87 and before). I attribute my brain-freeze to being a senior citizen probably time for me to give up cats for dogs. But maybe before I do, I would like to understand: what are the correct dimensions for the Grassman algebras? either remembering or forgetting some distinguished origin. The idea of "forget" (structure) seemed unreasonably hard for me to explain to a philosopher friend of mine, and I wound up getting confused myself because it is not always clear to me when "forgetting" is trivial or non-trivial. Best to you all. ........ Al Al Vilcius Campbellville, ON, Canada [For admin and other information see: http://www.mta.ca/~cat-dist/ ]