I recently stumbled on this equation
so how did $n^2 / n \lg n = n / n \lg n$ ?
2026-04-28 21:39:14.1777412354
How did n2 / n lg n = n / n lg n?
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Read your image closer.
$\dfrac{n^2}{n\lg n}$ did not become $\dfrac{n}{n\lg n}$. It became $\dfrac{n}{\lg n}$, by dividing both numerator and denominator by $n$.