Sometimes it feels like this could be how we finally make experiments to see what the theory of everything looks like, a bit like the first high energy experiments were from less exotic cosmic rays.
Local symmetry by Ciro Santilli 37 Updated 2025-07-16
Appears to be a synonym for: gauge symmetry.
A local symmetry is a transformation that you apply a different transformation for each point, instead of a single transformation for every point.
TODO what's the point of a local symmetry?
Bibliography:
Internet by Ciro Santilli 37 Updated 2025-07-16
Video 1.
Are YOU Ready for the INTERNET? by BBC (1994)
Source.
Register transfer level is the abstraction level at which computer chips are mostly designed.
The only two truly relevant RTL languages as of 2020 are: Verilog and VHDL. Everything else compiles to those, because that's all that EDA vendors support.
Much like a C compiler abstracts away the CPU assembly to:
  • increase portability across ISAs
  • do optimizations that programmers can't feasibly do without going crazy
Compilers for RTL languages such as Verilog and VHDL abstract away the details of the specific semiconductor technology used for those exact same reasons.
The compilers essentially compile the RTL languages into a standard cell library.
Examples of companies that work at this level include:
Teleprinter by Ciro Santilli 37 Updated 2025-07-16
Way, way before instant messaging, there was... teletype!
Video 1.
Using a 1930 Teletype as a Linux Terminal by CuriousMarc (2020)
Source.
Apple Inc. by Ciro Santilli 37 Updated 2025-07-16
Video 1.
The Mapple Store and Steve Mobs from The Simpsons
. Source.
Hypercube by Ciro Santilli 37 Updated 2025-07-16
square, cube. 4D case known as tesseract.
Convex hull of all (Cartesian product power) D-tuples, e.g. in 3D:
( 1,  1,  1)
( 1,  1, -1)
( 1, -1,  1)
( 1, -1, -1)
(-1,  1,  1)
(-1,  1, -1)
(-1, -1,  1)
(-1, -1, -1)
From this we see that there are vertices.
Two vertices are linked iff they differ by a single number. So each vertex has D neighbors.

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