Which is harder: classical or quantum physics?

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Erdem
which physics is easier?
which physics is dominant?
which physics is correct?

Classic or quantum

or even new one: quantassic physics.
 
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- I suppose classical concepts can be easier to deal with in some cases.

- Quantum is dominant at small size scales, classical at large ones. It depends on the situation and your assumptions.

- Both. Again, it depends what you're talking about. In many cases, classical physics gives a perfectly good picture of what's going on, although it may not take into account aspects that more advanced theories do.

And I have no idea what quantassic physics is.
 
One thing I remember about quantum, once I got over the conceptual hurdle, the math was much easier than the math for classical mechanics. I don't think that is an intrinsic property of the physics involved, but more a decision on the teaching community's part. You can make the coursework as hard as you want, but since students are going to have the conceptual difficulties with quantum, they ease off in the mathematical difficulties.

Njorl
 
Nearly all quantum mechanics is linear, while modern classical physics is into nonlinear stuff like chaos.

Since physics is like puzzles that the community makes up for itself, I think that any theoretical subject becomes as complex as the community can handle and then stops. Then you have to wait for someone like Witten who can handle harder puzzles to show the way forward, or you can "can" a lot of knowledge and go back to simpler reasoning at a higher level, like category theory.

Bottom line on this question, when you really get into them, classical and quantum physics are about equally hard. People's talents and tastes differ. Try to see which one you like to struggle with better, for struggle you will, and you might as well enjoy it.
 
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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