What does this notation 
mean? I am not getting the notation anywhere, even it is not available in wiki symbol list.
2026-03-25 14:19:21.1774448361
I am not getting this notation
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Usually, the notation $a_n \asymp b_n$ means that there is a constant $C>1$ independent from $n$ such that for all $n \in \mathbb N$, $$\frac{1}{C} |a_n| \leq |b_n| \leq C |a_n|.$$