@2e9f5e44 My phd thesis was on multigrid preconditioners, and “normalization” is the only term I could apply without looking anything up (“whitening” I’m pretty sure I know but would look up just to be sure; sphering? standardization? nope). 

 @c4e61add 👀 I have been obsessed with preconditioning for a couple years, I'll have a look at your thesis!

(There's a sketch of a paper there.)

Good info or what is At the top of mind for me,I'm considering a blog post.