Norm induced by an inner product Updated 2025-07-16
Nuclear weapon detonation Updated 2025-07-16
Simple group Updated 2025-07-16
Does not have any non-trivial normal subgroup.
And therefore, going back to our intuition that due to the fundamental theorem on homomorphisms there is one normal group per homomorphism, a simple group is one that has no non-trivial homomorphisms.
Analytic function Updated 2025-07-16
Documentation generator Updated 2025-07-16
Does Stockfish use the GPU? Updated 2025-10-14
As of 2023, apparently does not use GPUs, but rather a deep learning algorithm called efficiently updatable neural network which is designed to run well on CPUs:
Double pendulum Updated 2025-07-16
Systems biology Updated 2025-07-16
TempleOS Updated 2025-07-16
One is reminded of Ulillillia, see also: www.youtube.com/watch?v=9-79yOZ13qg The Story of Ulillillia by Atrocity Guide (2019)
DNA mutation type Updated 2025-07-16
Massive open online course Updated 2025-07-16
MOOCs are a bad idea. We don't want to simply map the pre-computer classroom to the Internet. The Internet allows, and requires, fundamentally new ways to do things. More like Stack Overflow/Wikipedia. More like OurBigBook.com.
Matrix operation Updated 2025-07-16
Self-adjoint operator Updated 2025-07-16
Ampere in the 2019 redefinition of the SI base units Updated 2025-07-16
Starting in the 2019 redefinition of the SI base units, the elementary charge is assigned a fixed number, and the Ampere is based on it and on the second, which is beautiful.
This choice is not because we attempt to count individual electrons going through a wire, as it would be far too many to count!
Rather, it is because because there are two crazy quantum mechanical effects that give us macroscopic measures that are directly related to the electron charge. www.nist.gov/si-redefinition/ampere/ampere-quantum-metrology-triangle by the NIST explains that the two effects are:
- quantum Hall effect, which has discrete resistances of type:for integer values of .
- Josephson effect, used in the Josephson voltage standard. With the Inverse AC Josephson effect we are able to produce:per Josephson junction. This is about 2 microvolt / GHz, where GHz is a practical input frequency. Video "The evolution of voltage metrology to the latest generation of JVSs by Alain Rüfenacht" mentions that a typical operating frequency is 20 GHz.But this is possible to implement in a single chip with existing micro fabrication techniques, and is exactly what the Josephson voltage standard does!
Those effect work because they also involve dividing by the Planck constant, the fundamental constant of quantum mechanics, which is also tiny, and thus brings values into a much more measurable order of size.
DokuWiki Updated 2025-07-16
Gallium Updated 2025-07-16
Germanium Updated 2025-07-16
Google project Updated 2025-07-16
Metric induced by a norm Updated 2025-07-16
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