Physics Travel Guide by Ciro Santilli 37 Updated 2025-07-16
DokuWiki about physics, mostly/fully written by Jakob Schwichtenberg and therefore focusing on particle physics, although registration might be open to all.
Matrix Lie group by Ciro Santilli 37 Updated 2025-07-16
This important and common simple case has easy properties.
Special linear group by Ciro Santilli 37 Updated 2025-07-16
Specials sub case of the general linear group when the determinant equals exactly 1.
Space group by Ciro Santilli 37 Updated 2025-07-16
All possible repetitive crystal structures!
219 of them.
This is a good book, it gives a summary of biographies, and a reasonable description of the main ideas, with many illustrations. Each subject is not presented in incredible detail, but it is a good overview of events.
Gold leaf by Ciro Santilli 37 Updated 2025-07-16
Video 1.
Hands: A Dublin Bookbinder
. Source. Some awesome gold leaf action!
The name makes absolutely no sense in modern terms, as nor colors nor light are used directly in the measurements. It is purely historical.

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