For example, question Q care about problem A and need some material about problem A. Can I answer the question by solving problem A directly?


No. Resource recommendation questions are for resource recommendations.

  • $\begingroup$ Agreed. Res. rec. questions should not be mixed with physics questions. I'd point out though, that the faq on res. rec. currently says: If you see a rather narrow resource recommendation, see if you can convert it into a question about the concept the OP really wants to know, rather than a request for resources that explain the concept. [...] if a resource recommendation looks directly answerable with a reasonable-length answer, then convert it to such a question. $\endgroup$
    – Urb
    Dec 7 '20 at 19:03

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