This question already has an answer here:

This question was correctly answered by someone and then the OP deleted it.

Is $xy y' = \sqrt{y^2 + 1}$ separable or non-separable?

Is there some rule against this?

It makes it appear that they are cheating on HW or something.

Also, for the person who answered it, is that really fair?


marked as duplicate by Martin Sleziak, Surb, Shailesh, Winther, yoknapatawpha Apr 19 '16 at 0:07

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    $\begingroup$ Hey, you're right! This happens from time to time. If you notice, you can flag a mod and we'll undelete it if we think the deletion is in bad faith. I've undeleted this question (not because I was the answerer --- I would have generally). And yes, it is unfair to the person who answered it. I might also mention that this doesn't come up if the answer is upvoted, as the OP cannot delete their own question if there are upvoted answers. $\endgroup$ – davidlowryduda Apr 17 '16 at 23:45
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    $\begingroup$ Ah, further, this user has done this before to other users. Good catch. $\endgroup$ – davidlowryduda Apr 17 '16 at 23:46
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    $\begingroup$ It is one reason to be generous in quickly up-voting an otherwise unloved only Answer on an on-topic Question, as this prevents the "bilking" behavior, taking the benefit of an Answer without contributing that content to other Readers. $\endgroup$ – hardmath Apr 18 '16 at 0:30
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    $\begingroup$ Related: Why do some users delete their questions after receiving an answer? $\endgroup$ – Martin Sleziak Apr 18 '16 at 3:53

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