Even though Lil’ Wayne has been a thing for half a decade, I only just now listened to a song of his: *Hustler Musik*. I like it.

I think this video is juxtaposing different people’s work lives—unemployed responsible guy, cop, drug dealer, stripper.

And check this out **at 3:09, 3:17, 3:30 and 3:54 — one of the strippers is reading Tensor Calculus by Synge & Schild.**

Also a quantum chemistry book (can’t make out the author).

- From the main girl’s facial expression at 3:54, I think it isn’t her book. But then again, she counts her money on it which suggests it is hers.
- Is the reader currently enrolled in a degree programme?
- Both books look in excellent condition — a little too unbent for her to be very far through them. (the softback cover would lift up more if she had made it to chapter 3)
- How much down-time do you have between dances? I would think there’s some other “duty” or else they would send you home. Maybe working the crowd to sell private dances or trying to get guys to buy drinks.
- Then again, these dense books are easy to fill up on quickly. When I was working as an artists’ model I would read a bit of maths before I started posing, that way I would have plenty to think about while I stood/sat there.
- Even though it is a stereotype for a sex worker to say “I’m doing this to put myself through university” — because of the common belief that university is good and valid, much more so than just reading about quantum chemistry because you’re inherently interested in the universe — I don’t think it’s at all unrealistic to show a beautiful woman being into scientific / mathematical erudition. I hate the “attractive people are stupid” stereotype even more than I hate the “nerds rule the world” stereotype. And I actually know a girl who used to dance and at the time had attained an even higher level of mathematical erudition than this girl.
- A young, attractive girl is much more likely to be able to make good money dancing than by knowing about quantum chemistry. Dancing is also a pick-up job in a way that, for example, working at Fermilab is not. I expect life is freer when you’re doing something like that. Also you don’t have to dance 40-60 hours/week, which leaves plenty of time for intellectual pursuits. I am never surprised to learn that someone with a lot of mathematical erudition is working in a job completely lacking university pre-requisites.
- I actually have a copy of Synge & Schild — it was recommended supplementary reading in differential geometry class. The writing is good, but for pleasure reading I prefer the diagrams of
*Solid Shape*—a book I’ve extolled in these pages before.

**WTF is a tensor?** I have a much longer post about the topic in my Drafts folder (along with 1150 others), but here’s a quickie preview:

- A matrix has two subscripts (row & column); a tensor has three or more subscripts.
- Just like the number of rows and columns in a matrix tell you “how many input dimensions” and “how many output dimensions”, tensors can also input/output vectors, matrices, 9-tensors, and so on. A weighted inner product looks like a
`(0,2)`

tensor, for example. A matrix looks like a`(1,1)`

tensor, a vector looks like a`(0,1)`

tensor, and a 1-form looks like a`(1,0)`

tensor. - A typical example of a tensor is the stress/strain tensor:

The piece I have in my drafts folder is talking about foreign exchange rates. - And back to the girl’s pair of textbooks—the two texts do go together. If you think about stress/strain tensors acting on a bridge or something—well if we were talking at a small scale then the forces could be electrical rather than mechanical and operating on a tetrahedron-shaped methane molecule. Tensors are the normal way to combine lots of different forces on different faces of an object.

To understand tensors, I would recommend looking at the Wikipedia page and Chris Tiee’s essay *Covariance, Contravariance, Densities, and All That* and maybe also the fourth chapter of MIT OCW’s intro to geophysics lecture notes (that’s on the stress/strain tensors).