Ciro Santilli
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Pauli exclusion principle | 🗖 nosplit | ↑ parent "Spin" | 102, 4, 128

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Initially a phenomenological guess to explain the periodic table. Later it was apparently proven properly with the spin-statistics theorem, https://physics.stackexchange.com/questions/360140/theoretical-proof-of-paulis-exclusion-principle.
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And it was understood more and more that basically this is what prevents solids from collapsing into a single nucleus, not electrical repulsion: electron degeneracy pressure!
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Video 65. "The Biggest Ideas in the Universe | 17. Matter" published by Sean Carroll on 2020-07-14. Source. Gives a very quick and high level overview of renormalization. It is not enough to satisfy Ciro Santilli, but it goes some way.
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