Ciro Santilli @cirosantilli 35

Vs uranium: uranium vs plutonium Quora answer by Ciro Santilli.

What a material:

The real explanation: stackoverflow.com/questions/1780599/what-is-the-meaning-of-posix/31865755#31865755

Intuitive definition: real group of rotations + reflections.

Mathematical definition that most directly represents this: the orthogonal group is the group of all matrices that preserve the dot product.

Group of the unitary matrices.

Complex analogue of the orthogonal group.

One notable difference from the orthogonal group however is that the unitary group is connected "because" its determinant is not fixed to two disconnected values 1/-1, but rather goes around in a continuous unit circle. $U(1)$ is the unit circle.

Seems to be a GNU Binutils extension

In this project Ciro Santilli extracted (almost) all Git commit emails from GitHub with Google BigQuery! The repo was later taken down by GitHub. Newbs, censoring publicly available data!

Ciro also created a beautifully named variant with one email per commit: github.com/cirosantilli/imagine-all-the-people. True art. It also had the effect of breaking this "what's my first commit tracker": twitter.com/NachoSoto/status/1761873362706698469

Looking for formats that:

Bibliography:

Disclaimer: closed source vendors tend to be highly secretive, solving small issues without any reply, so I use my best judgement given the lack of feedback.

Something analogous to a group isomorphism, but that preserves whatever properties the given algebraic object has. E.g. for a field, we also have to preserve multiplication in addition to addition.

Other common examples include isomorphisms of vector spaces and field. But since both of those two are much simpler than groups in classification, as they are both determined by number of elements/dimension alone, see:we tend to not talk about isomorphisms so much in those contexts.

On github.com/cirosantilli/china-dictatorship: