Russell Staandish wrote
> Equivalence in the sense of category theory's notion of duality. In
> Venn diagrams, for instance, the empty set is the dual of the
> universal set.

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> More particularly to the "bitstring ensemble" ASKA "Schmidhuber
> ensemble"* or UD*, the empty observer moment can be identified
> with Nothing, and the empty observer moment is the whole plenitude.
> Of course the flip side to "can be" is "can't be" - but in that
case,
> I'm afraid, Nothing does not seem to be a well defined concept (I
> stand to be corrected of course!).
Interesting, I'll bear it in mind, along with Bruno's comments.