We don't just post answers to self-study questions where we give the proof of whatever the OP is asking. I think this is a good policy. However, that seems to mean that any post in response to a self-study question is going to be more like a comment and dialogue, at least according to the usual rules about .

What would warrant an answer to a self-study question as opposed to a comment?

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    $\begingroup$ What I have sometimes done is engage the OP in a conversation to help them figure it out for themselves. When they have, I convert the info from the comments into an official answer. Another possibility is to post a hint that should be enough to get them past the stumbling block, but doesn't answer the Q for them, as an answer, & have the discussion below that (here is an example where I did that). $\endgroup$ – gung - Reinstate Monica Oct 4 '19 at 4:18

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