History of quantum mechanics Updated +Created
The discovery of the photon was one of the major initiators of quantum mechanics.
Light was very well known to be a wave through diffraction experiments. So how could it also be a particle???
This was a key development for people to eventually notice that the electron is also a wave.
This process "started" in 1900 with Planck's law which was based on discrete energy packets being exchanged as exposed at On the Theory of the Energy Distribution Law of the Normal Spectrum by Max Planck (1900).
This ideas was reinforced by Einstein's explanation of the photoelectric effect in 1905 in terms of photon.
In the next big development was the Bohr model in 1913, which supposed non-classical physics new quantization rules for the electron which explained the hydrogen emission spectrum. The quantization rule used made use of the Planck constant, and so served an initial link between the emerging quantized nature of light, and that of the electron.
The final phase started in 1923, when Louis de Broglie proposed that in analogy to photons, electrons might also be waves, a statement made more precise through the de Broglie relations.
This event opened the floodgates, and soon matrix mechanics was published in quantum mechanical re-interpretation of kinematic and mechanical relations by Heisenberg (1925), as the first coherent formulation of quantum mechanics.
It was followed by the Schrödinger equation in 1926, which proposed an equivalent partial differential equation formulation to matrix mechanics, a mathematical formulation that was more familiar to physicists than the matrix ideas of Heisenberg.
Inward Bound by Abraham Pais (1988) summarizes his views of the main developments of the subjectit:
History of the University of Oxford Updated +Created
Video 1.
History of Oxford University by Chris Day (2018)
Source. A large part of the video talks about how the insane system of colleges of the University of Oxford came about organically.
Infinity Updated +Created
Chuck Norris counted to infinity. Twice.
There are a few related concepts that are called infinity in mathematics:
Metabolic pathway Updated +Created
Some notable examples:
Skew-symmetric bilinear map Updated +Created
Sponsor Ciro Santilli's work on OurBigBook.com / 14 Updated +Created
tmux Updated +Created
If session autosave was finally mainlined, this would be Nirvana.
Apache License Updated +Created
Aperiodic monotile Updated +Created
University spin-off company Updated +Created
CIA 2010 covert communication websites / Find missing hits in IP ranges Updated +Created
All IP ranges have some holes in them for which we don't have a domain name.
It is because there was nothing there, or just because we don't have a good enough reverse IP database?
It is possible that DomainTools could help with a more complete database, but its access is extremely expensive and out of reach at the moment.
Censys is another option that would be good to try.
Putting 140 USD into WhoisXMLAPI to get all whois histories of interest for possible reverse searches would also be of interest.
Doing physics means calculating a number Updated +Created
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".
How Ciro Santilli manages to write so much Updated +Created
Personal knowledge instance Updated +Created
Sitare Foundation Updated +Created
Special linear group of dimension 2 Updated +Created
Aberration (astronomy) Updated +Created
A Chinese Ghost Story Updated +Created
OK, the Good film tag might imply that you are a Sinophile.
The adaptation is very loose.
Figure 1.
Poster of A Chinese Ghost Story
.
Finite special general linear group Updated +Created
Just like for the finite general linear group, the definition of special also works for finite fields, where 1 is the multiplicative identity!
Note that the definition of orthogonal group may not have such a clear finite analogue on the other hand.

Unlisted articles are being shown, click here to show only listed articles.