@stressedout Can you please elaborate on why that should be deleted? As far as I can tell, Jose is stressing the difference between "every subset" (in his post) and "a subset" (in the question).
But if you're referring to the question, yes it is a PSQ and shouldn't be kept, but non-moderators cannot delete it so quickly after closure.
@user21820 Jose himself is the person who deletes every PSQ question that others answer. Even questions that were several years old have been voted for deletion by him. So it's only fair that he follows the same policy that he promotes. Plus, the question adds nothing to the community and it has probably been answered a million times before. And the wording of the question is ambiguous too. It doesn't mention whether the OP wants every subset to be clopen or only one particular subset.
@JoséCarlosSantos A problem statement question is a question that essentially (and often, literally) consists of nothing more than the statement of a problem. And just because the OP hasn't bothered to write a clear question, that doesn't make the situation any better. As a matter of fact, it makes it worse.
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user12692
11:43 PM
@darijgrinberg Check the profile of the user Young, whose 2016 posts was targeted for closing/deleting in this room last year. Search Young in the upright corner box, you will see the story.
user12692
@darijgrinberg I do not know how the almost daily D list is made, but I don't consider this random.
$$ z\frac{\partial z}{\partial x}+\left(z^2-x^2\right)\frac{\partial z}{\partial y}+x=0 \\
L:y=x^2, z=2x$$
