Superfluid helium-3 by Ciro Santilli 40 Updated 2025-07-16
Surprisingly, it can also become a superfluid even though each atom is a fermion! This is because of Cooper pair formation, just like in superconductors, but the transition happens at lower temperatures than superfluid helium-4, which is a boson.
aps.org/publications/apsnews/202110/history.cfm: October 1972: Publication of Discovery of Superfluid Helium-3 contains comments on the seminal paper and a graph which we must steal.
ARPANET by Ciro Santilli 40 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 40 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 40 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

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