Fluorescent lamp Updated +Created
Photonics Updated +Created
The science and engineering of photons!
A bit more photon-specific than optics.
Unicode art Updated +Created
Interesting transactions Updated +Created
This is about transactions that are interesting not because of their inscriptions, but for some other reason, such as transaction size, etc.
Philosophy of Science Updated +Created
Shoes Updated +Created
For sizing see also: Ciro Santilli's body.
Social media as a public utility Updated +Created
Ciro Santilli thinks that maybe the government does not need to provide those, but it needs to regulate the fuck out of them, notably control over censorship in those platforms: the deplatforming of Donald Trump.
Related:
English (language) Updated +Created
Greek (language) Updated +Created
Free will Updated +Created
Ciro Santilli does not believe in free will of course because he is an agnostic and he believes that brains are controlled by the laws of physics, see also: physics and the illusion of life.
Sin Updated +Created
Visualizing the Riemann hypothesis and analytic continuation by 3Blue1Brown (2016) Updated +Created
Good ultra quick visual non-mathematical introduction to the Riemann hypothesis and analytic continuation.
pip (package manager) Updated +Created
How many stupid bugs. How many stupid bugs do we need to face???
Quantum field theory in a nutshell by Anthony Zee (2010) Updated +Created
ISBN-13: 978-0691140346
lecture 1 mentions that this book is quick and dirty, as one might guess from the title. Ciro Santilli thinks he's gonna like this one.
First edition: from 2003, www.amazon.com/dp/0691010196, ISBN-13: 978-0691010199.
Park Tool PAW-12 adjustable wrench Updated +Created
Selective breeding Updated +Created
Empirical formula Updated +Created
Dedekind cut Updated +Created
Baker-Campbell-Hausdorff formula Updated +Created
Solution for given and of:
where is the exponential map.
If we consider just real number, , but when X and Y are non-commutative, things are not so simple.
Furthermore, TODO confirm it is possible that a solution does not exist at all if and aren't sufficiently small.
This formula is likely the basis for the Lie group-Lie algebra correspondence. With it, we express the actual group operation in terms of the Lie algebra operations.
Notably, remember that a algebra over a field is just a vector space with one extra product operation defined.
Vector spaces are simple because all vector spaces of the same dimension on a given field are isomorphic, so besides the dimension, once we define a Lie bracket, we also define the corresponding Lie group.
Since a group is basically defined by what the group operation does to two arbitrary elements, once we have that defined via the Baker-Campbell-Hausdorff formula, we are basically done defining the group in terms of the algebra.
An Introduction to Tensors and Group Theory for Physicists by Nadir Jeevanjee (2011) Updated +Created
This does not seem to go deep into the Standard Model as Physics from Symmetry by Jakob Schwichtenberg (2015), appears to focus more on more basic applications.
But because it is more basic, it does explain some things quite well.

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