解析数论导论中的符号

1

1.2 d|n divisibility
1.3 (a,b) aDb gcd
exercise21 [a,b] aMb gcd(a,b)

2

2.2
$\mu(n)$ mobius function
$[x]$ greatest integer $\le$ x

2.3
$\varphi(x)$euler totient function

2.7
f*g dirichlet product
N(n)=n
I(n)