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发帖数: 160 | 1 The answer to your second question is: position operator as a physical
quantity itself is always the SAME, "independent" (in certain sense, see
below) of the system. When you are talking about the notion "from system to
system", you are actually talking about different mathematical representations
to the SAME physical object. You should be careful of the difference between
physical quantity as an object of itself and its mathematical descriptions.
More specifically, the physical quantity in quan |
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