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1answer
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Are questions about derivations in papers published in scientific journals, on-topic?

I'm not sure if this is the right place for this question but If I have a specific question about a derivation step in a paper published in Physical Review A, for example. Can I ask it here?
7
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Are physics-related notation and terminology questions on-topic?

This is prompted by What is the origin of the naming convention for position functions? which asks why s is used as the letter for position. Here are some more examples. which letter to use for a ...