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comment Express unit sphere as countable union of great circles?
@Misakov The version I state is equivalent to yours if you replace union with intersection (see e.g. here. In your other comment, if you replace dense with open dense in the conclusion then yes, it seems to me that you can argue like that.
May
8
comment Express unit sphere as countable union of great circles?
@Misakov I elaborated on this hint. Maybe it helps you answer your comment here.
May
8
answered Express unit sphere as countable union of great circles?
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comment $p$-adic completion of integers
@user135520 Which sequence are you talking about? It's quite some time since I wrote this post...
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revised Weak convergence in $D^{1,p}(\mathbb{R}^n)$ and in $\mathcal{M}(\mathbb{R}^n)$
edited title
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comment Intersection of all neighborhoods of zero is a subgroup
@TobiasKildetoft Thank you for your comment!
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Feb
20
comment Are these linear maps bounded?
Seriously: first you pretend you can solve the exercise by "giving" "overgenerous hints" and when I press you for an answer you admit you can't solve it either.
Feb
20
comment Are these linear maps bounded?
I think is clear that the idea of the exercise is to give an explicit example.
Feb
20
comment Are these linear maps bounded?
What's an example of an oscillating function with compact support?