I am dealing with this exercise. 
I don't know how to reason about it. Maybe I should prove that $\forall C>0 \exists \bar n :||u_n||_{L^\infty}>C\forall n>\bar n$.
Could you give me a hint?
2026-04-28 16:45:19.1777394719
Subsequence in $W^{1,1}$
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