Renormalization

www.quora.com/What-is-renormalization-in-quantum-theory-explained-to-graduated-only-not-doctors/answer/Paul-Mainwood covers the simpler Ising model case

The Biggest Ideas in the Universe | 11. Renormalization by Sean Carroll (2020)

Source. Gives a very quick and high level overview of renormalization. It is not enough to satisfy Ciro Santilli as usual for other Sean Carroll videos, but it goes some way.

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Mathematical formulation of quantum field theory
Quantum field theory
Relativistic quantum mechanics
Quantum mechanics
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Ising model
Lecture 1
Renormalization
Richard Feynman Quantum Electrodynamics Lecture at University of Auckland (1979)