LECTURE NOTES IN ANALYSIS (2011)
《LECTURE NOTES IN ANALYSIS (2011)》 · 第 28 页 · Section 1.3「Primes」
We say that $f(x)$ is asymptotic to $g(x)$, or write $f(x)\sim g(x)$, if $\lim_{x\to\infty}f(x)/g(x)=1$.