Hn=∑k=1n1k,n≥0(1)\large H_n=\sum_{k=1}^n\frac{1}{k},\; n \geq 0 \tag{1} Hn=k=1∑nk1,n≥0(1)
H2m≥1+m2(2)\large H_{2^m}\geq 1+ \frac{m}{2} \tag{2} H2m≥1+2m(2)
← 1.2.6 二项式系数 1.2.8 斐波那契数→
