[ekjhgkejhgk]

> (ii) linear functions are terrible where equi-label regions have a partitioned structure.

Could you explain what "equi-label regions having a partitioned structure" mean?

[srean]

I missed a word "recursively", that I have edited in my original comment now.

Consider connected regions in the domain that have the same label. Much like countries on a political map. The situation where this has a short description in terms of recursive subdivision of space, is what I am calling a partitioned structure. It's really rather tautological.

[ekjhgkejhgk]

"recursively partitioned" sounds like a fractal to me. Not sure what you really mean.