I am still trying to figure out a refinement, I hope I’ll manage!

]]>(thank you for fixing my syntax!)

]]>By the way, to use TeX here, you have to enclose the math with

$latex $

with the word ‘latex’ appearing directly after the first dollar sign, no space between, but then a space after it.

]]>More precisely, when you compose two morphisms, some blocks may lose contact to the input and the output. In this case, these blocks (let’s say there are of them) are omitted and the result is multiplied with the -th power of a parameter, usually denoted .

When is small, there is a basis of the centralizer algebra indexed (!) by set partitions into at most blocks.

Still, there are some mysterious open questions…

]]>Davis’s law of small devices:

A device can be made arbitrarily small if it doesn’t have to work.