Ciro Santilli @cirosantilli 37

LLVM front-end for C and related language like C++ etc.

Alternative to the Lorentz gauge, but less used in general as it is not as nice for relativity invariance.

Homepage: eli.thegreenplace.net/

Amazing systems programming tutorials. Whenever you Google a hard topic, his blog comes up.

Also has many great contributions on Stack Overflow: stackoverflow.com/users/8206/eli-bendersky

As of 2016, Eli worked at Google (reference). TODO before that, I had found his earlier info previously but lost it.

Eli focuses mostly on compiler toolchains.

He also has some mathematics stuff, so cute: eli.thegreenplace.net/2015/change-of-basis-in-linear-algebra/

Two observers travel at fixed speed relative to each other. They synchronize origins at x=0 and t=0, and their spacial axes are perfectly aligned. This is a subset of the Lorentz group. TODO confirm it does not form a subgroup however.

Basically a synonym of Lorentz covariance?

Physics from Symmetry by Jakob Schwichtenberg (2015) page 66 shows one in terms of 4x4 complex matrices.

More importantly though, are the representations of the Lie algebra of the Lorentz group, which are generally also just also called "Representation of the Lorentz group" since you can reach the representation from the algebra via the exponential map.

Bibliography:

Ciro Santilli hates it when an expert does this!!!

If you estimate that the audience won't know the name of the concept, that's fine, do explain it as well.

But you must also give the name!!!

This also manifests itself when news outlets omit foreign names from headlines, notably Chinese, but likely happens to all non-european languages too.

The variables of the Lagrangian, e.g. the angles of a double pendulum. From that example it is clear that these variables don't need to be simple things like cartesian coordinates or polar coordinates (although these tend to be the overwhelming majority of simple case encountered): any way to describe the system is perfectly valid.

In quantum field theory, those variables are actually fields.

The inverse of the magnetic flux quantum.

Very hot stuff! It's like ISA-portable assembly, but with types! In particular it also it deals with calling conventions for us (since it is ISA-portable). TODO: isn't that exactly what C does? :-) LLVM IR vs C

Documentation: llvm.org/docs/LangRef.html

PCIe TLC OPAL2.

www.samsung.com/semiconductor/ssd/client-ssd/MZVLB512HAJQ/ (archive).

www.samsung.com/semiconductor/global.semi/file/resource/2018/05/PM981_M.2_SSD_Datasheet_v1.3_for_General.pdf | web.archive.org/web/20181224225410/https://www.samsung.com/semiconductor/global.semi/file/resource/2018/05/PM981_M.2_SSD_Datasheet_v1.3_for_General.pdf

sudo hdparm -Tt /dev/nvme0n1p5 on Ubuntu 20.04:

 Timing cached reads:   29812 MB in  1.99 seconds = 15007.00 MB/sec
 HDIO_DRIVE_CMD(identify) failed: Inappropriate ioctl for device
 Timing buffered disk reads: 6328 MB in  3.00 seconds = 2109.00 MB/sec

Nominal maximum sequential read speed: 3,000 MB/s

One strange quark bound with one up quark or a down quark. 6 combinations exist, 4 if we consider antiparticles the same as particles.