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It is not hash, I welcome criticism! This is how we improve!! And yes, my TLDR is mostly based on the last pages. The rest just seems to present the ideas that

It is not hash, I welcome criticism! This is how we improve!! And yes, my TLDR is mostly based on the last pages. The rest just seems to present the ideas that helped reach this conclusion. Regarding renormalization, there are many things I (wrongly?) call a renormalization - even doing a PCA and dropping the components that add little to the variance of the data. This destructs some signal, unless you believe that is just noise and the data should only be analyzed along say the first 3 PCs. I'd call that a renormalization in a 3d space. Maybe this is an improper use of the word in this context?

auntienomen 9y ago
In QFT, renormalization is a way of mapping the behavior of a QFT at one distance scale onto its behavior at a different distance scale. Long story short, there's an equivalence between changing distance scales and changing the coupling constants in the theory. Once you get this mapping right, you discover the infinities present in the naive computations have vanished. (There is actually a quantity which has its normalization reset in this mapping, but that's actually the least interesting part of the story. It's somewhat odd that it's become the name for the whole mapping.)