Recall
After watching last night The Big Bang Theory the other night last night I looked up Loop Quantum Gravity which got me reading about Renormalization because I did that back in the days I did my PhD though I'd forgotten many of the details.
I the article about Renormalization I read the line "integration around the poles" which immediately flashed into my head a diagram I remember from my A-level maths. So today, between doing chores, I've been reading up all the A-level maths stuff. I started with contour integration* where all sorts of phrases started to ring a bell "Cauchy integral theorem", "residues", "branch cuts" and "integrating around the pole". Then I read up on differential equations with "separation of variables" and "particular solutions"
There was even more stuff** that rang a bell as soon as I read it so I've been quite impressed today by my brain's storage capacity.
* The diagram that had flashed into my head was that of a "keyhole contour"
** On matrices and complex numbers and the likes
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