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Joe
  • Member for 11 years, 6 months
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103 votes
6 answers
16k views

Trace of a commutator is zero - but what about the commutator of $x$ and $p$?

12 votes
2 answers
3k views

When and how did the idea of the tensor product originate in the history quantum mechanics?

11 votes
1 answer
288 views

What strategies can a researcher use when confronted with a long and complicated symbolic expression?

7 votes
6 answers
9k views

When driving uphill why can't I reach a velocity that I would have been able to maintain if I started with it?

6 votes
2 answers
2k views

Can we impose a boundary condition on the derivative of the wavefunction through the physical assumptions?

3 votes
4 answers
10k views

Why does smoke go out the window of the car - and what if there's wind blowing instead of the car moving?

3 votes
2 answers
611 views

Charged quantum particle in a magnetic field - choosing a different gauge leads to different wavefunctions

3 votes
1 answer
2k views

Does special relativity unify the two phenomena at the base of Faraday's flux law (was Feynman wrong in this case)?

2 votes
1 answer
304 views

Scattering from a box potential of width $L$ doesn't reproduce a step potential in the limit $L \rightarrow \infty$