Ciro Santilli @cirosantilli 35

${\mathbb{R}}^n$ with extra structure added to make it into a metric space.

The identity matrix.

Notably used to connect:

You can buy large sets of them in combitation of male/male, male/female, female/female. Male/male is perhaps the most important

The opposite of quasiparticle, see notaby: quasiparticles vs elementary particles.

Ciro Santilli was touched by this, and then watched several other documentaries by Curtis.

Part of Ciro asks if it is all a big conspiracy theory. But it feels and sounds so right.

Notably the part of the governments have lost all power to companies, and can't do anything meaningful anymore to actually represent the people, because globalization reduces the power of governments.

Their split in 1970 was a huge fuck up. If it were a single entity, the university would likely be in the top 10 university rankings, undoubtedly top 20. But as of 2020 French universities only appear instead in the top 40s or 50s.

Inkscape is a a good software for editing/creating SVG files.

Its functionality is fundamental for as a software for drawing geometry diagrams, as it is a good middle ground between algorithmic generation, and raster graphics.

At 1.0.2, its UI is a bit terrible:

And it crashes from time to time on Ubuntu 21.04. And it has some glaring bugs, e.g.:

But still, it is a very good initiative.

What would be really amazing is if they had constraints: gitlab.com/inkscape/inbox/-/issues/1465 like proper CAD software, it would make it possible to not have to redo entire diagrams when you want to change a small part of them.

OK, so let's verify the main desired consequence of the Lorentz transformation: that everyone observes the same speed of light.

Observers will measure the speed of light by calculating how long it takes the light going towards $+x$ cross a rod of length $L=x_2-x_1$ laid in the x axis at position $X1$.

TODO image.

Each observer will observe two events:

Supposing that the standing observer measures the speed of light as $c$ and that light hits the left side of the rod at time $T1$, then he observes the coordinates:

Now, if we transform for the moving observer:and so the moving observer measures the speed of light as: