Say there is ˆJ=exp[−iˆpl/ℏ] and ˆU=exp[−iˆHt/ℏ], where ˆH is time-independent.
Can we say anything about [ˆJ,ˆU]? Is it zero? How do we show this?
For example if ˆH=ˆp2/2m+mω2ˆx2/2.
What is stagnation point in fluid mechanics. At the open end of the pitot tube the velocity of the fluid becomes zero.But that should result...
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