Learn Group Theory for Physics: Beginner Guide

greatscott
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I'd like to learn group theory to understand QM and particle theory, and I looked at several books on discrete mathematics but they didn't mention SU groups. I'm an absolute beginner in group theory or discrete math, but I don't want to spend too much time on materials unrelated to physics. Do you have a suggestion on a good book or a good way to study group theory?
 
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Well, part of the problem is that SU(2), etc, is not discrete! It's continuous and has a nontrivial topology: it's an example of a Lie group. (pronounced "lee group")
 
I have heard of Lie groups. What are the prerequisites for studying Lie groups? I don't know what topology is per se, but I have taken a Fourier analysis class. I only have a superficial knowledge about Hilbert space (not in a rigorous "theorems, proofs and q.e.d's" manner).
 
Not an expert in QM. AFAIK, Schrödinger's equation is quite different from the classical wave equation. The former is an equation for the dynamics of the state of a (quantum?) system, the latter is an equation for the dynamics of a (classical) degree of freedom. As a matter of fact, Schrödinger's equation is first order in time derivatives, while the classical wave equation is second order. But, AFAIK, Schrödinger's equation is a wave equation; only its interpretation makes it non-classical...
Insights auto threads is broken atm, so I'm manually creating these for new Insight articles. Towards the end of the first lecture for the Qiskit Global Summer School 2025, Foundations of Quantum Mechanics, Olivia Lanes (Global Lead, Content and Education IBM) stated... Source: https://www.physicsforums.com/insights/quantum-entanglement-is-a-kinematic-fact-not-a-dynamical-effect/ by @RUTA
Is it possible, and fruitful, to use certain conceptual and technical tools from effective field theory (coarse-graining/integrating-out, power-counting, matching, RG) to think about the relationship between the fundamental (quantum) and the emergent (classical), both to account for the quasi-autonomy of the classical level and to quantify residual quantum corrections? By “emergent,” I mean the following: after integrating out fast/irrelevant quantum degrees of freedom (high-energy modes...
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