Unverified Commit 2c6e8aa7 authored by Trisolaris HD's avatar Trisolaris HD Committed by GitHub
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Update mobius.md

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### 引理 2

$$
\forall n \in N,  |\left\{ \lfloor \frac{n}{d} \rfloor \mid d \in N \right\}| \leq \lfloor 2\sqrt{n} \rfloor
\forall n \in N,  \left|\left\{ \lfloor \frac{n}{d} \rfloor \mid d \in N \right\}\right| \leq \lfloor 2\sqrt{n} \rfloor
$$

$|V|$ 表示集合 $V$ 的元素个数