Atheism Updated 2025-07-16
FaceMash Updated 2025-07-16
Git UI Updated 2025-07-16
Perfect Git integration belongs in integrated development environments :-)
Cycle notation Updated 2025-07-16
A concise to describe a specific permutation.
A permutation group can then be described in terms of the generating set of a group of specific elements given in cycle notation.
E.g. en.wikipedia.org/w/index.php?title=Mathieu_group&oldid=1034060469#Permutation_groups mentions that the Mathieu group is generated by three elements:
  • (0123456789a)
  • (0b)(1a)(25)(37)(48)(69)
  • (26a7)(3945)
which feels quite compact for a simple group with 95040 elements, doesn't it!
gwern.net Updated 2025-07-16
One thing that annoys Ciro Santilli about that website are the footnote overload. Ciro likes linear things.
Meson Updated 2025-07-16
composite particle made up of an even number of elementary particles, most commonly one particle and one anti-particle.
This can be contrasted with mesons, which have an odd number of elementary particles, as mentioned at baryon vs meson vs lepton.
After something broke on the website due to SQLite vs PostgreSQL inconsistencies and took me a day to figure it out, I finally decided to update the test system so that OURBIGBOOK_POSTGRES=true npm test will run the tests on PostgreSQL.
Originally, these were being run only on SQLite, which is the major use case for OurBigBook CLI, which came before the website.
But the website runs on PostgreSQL, so it is fundamental to test things in PostgreSQL as well.

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