British pragmatism Updated 2025-07-16
The British are very pragmatic. This has good and bad effects.
For example, a good effect is that many things work pretty well, such as the government. This also helped industry develop.
A bad effect is that they sometimes settle on local minima forever. Examples:
  • as of 2020, they are still using imperial units in everyday life, rather than International System of Units, which was setup by the French, who are much more idealistic, and can therefore can break from such insanity more often.
  • the persistence of the insane system of colleges of the University of Oxford
  • the incredibly late date of the decimal day in 1971, and that was partly due to the advent of the computer. That one was too much, even for the Brits, or maybe it helped that the greedy financiers were involved
  • the British train system as of the 2010's, which is completely not unified, each part operated by a different company with different standards. Private and public unification efforts are ongoing, Trainline being one of the best/only private buy from any line unification approaches.
  • Church of England priests can marry, which reduces the proportion of pedophiles. Also women were accepted starting in the 1970's in certain dioceses (non uniform rules as usual, typical of English pragmatism), including for bishop
If it ain't totally broken, just let it continue forever! See also: Section "History of the University of Oxford".
Distributive property Updated 2025-07-16
One of the defining properties of algebraic structure with two operations such as ring and field:
This property shows how the two operations interact.
Four-vector Updated 2025-07-16
Ubuntu 21.04 Updated 2025-07-16
They are sorted in order of "most likely to get done first".
Top one: OurBigBook.com.
Broadcom Updated 2025-07-16
Brownian motion Updated 2025-07-16
Small microscopic visible particles move randomly around in water.
If water were continuous, this shouldn't happen. Therefore this serves as one important evidence of atomic theory.
The amount it moves also quantitatively matches with the expected properties of water and the floating particles, was was settled in 1905 by Einstein at: investigations on the theory of the Brownian movement by Einstein (1905).
This suggestion that Brownian motion comes from the movement of atoms had been made much before Einstein however, and passed tortuous discussions. Subtle is the Lord by Abraham Pais (1982) page 93 explains it well. There had already been infinite discussion on possible causes of those movements besides atomic theory, and many ideas were rejected as incompatible with observations:
Further investigations eliminated such causes as temperature gradients, mechanical disturbances, capillary actions, irradiation of the liquid (as long as the resulting temperature increase can be neglected), and the presence of convection currents within the liquid.
The first suggestions of atomic theory were from the 1860s.
Tiny uniform plastic beads called "microbeads" are the preferred 2019 modern method of doing this: en.wikipedia.org/wiki/Microbead
Original well known observation in 1827 by Brown, with further experiments and interpretation in 1908 by Jean Baptiste Perrin. Possible precursor observation in 1785 by Jan Ingenhousz, not sure why he wasn't credited better.
Video 1.
Observing Brownian motion of micro beads by Forrest Charnock (2016)
Source.
Four-gradient Updated 2025-07-16
A 4D gradient with some small special relativity specifics added in (the light of speed and sign change for the time).
tmux Updated 2025-07-16
If session autosave was finally mainlined, this would be Nirvana.
Wei Dai Updated 2025-07-16
In Physics, in order to test a theory, you must be able to extract a number from it.
It does not matter how, if it is exact, or numerical, or a message from God: a number has to come out of the formulas in the end, and you have to compare it with the experimental data.
Many theoretical physicists seem to forget this in their lectures, see also: Section "How to teach and learn physics".

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