ARPANET by Ciro Santilli 37 Updated 2025-07-16
Bibliography:
Great overview of the earlier history of unit standardization.
Gives particular emphasis to the invention of gauge blocks.
Hamilton's equations by Ciro Santilli 37 Updated 2025-07-16
Analogous to what the Euler-Lagrange equation is to Lagrangian mechanics, Hamilton's equations give the equations of motion from a given input Hamiltonian:
So once you have the Hamiltonian, you can write down this system of partial differential equations which can then be numerically solved.
Gamma by Ciro Santilli 37 Updated 2025-07-16
It is fun to see that C and G have been confused since antiquity:
  • the modern sound is G
  • in terms of modern letters, both C and G split from gamma
Psi (Greek) by Ciro Santilli 37 Updated 2025-07-16
As if it weren't enough, there's also a Cyrillic script psi that is slightly different. Life's great.
Gravity by Ciro Santilli 37 Updated 2025-07-16
In 2020 physics, best explained by general relativity.
TODO: does old Newtonian gravity give different force results than general relativity?
Gallium arsenide by Ciro Santilli 37 Updated 2025-07-16
This is apparently the most important III-V semiconductor, it seems to actually have some applications, see also: gallium arsenide vs silicon.

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