Mathematics – Classical Analysis and ODEs
Scientific paper
2003-06-16
Mathematics
Classical Analysis and ODEs
5 pages
Scientific paper
For any natural number $n\in\mathbb{N}$, $ \frac{1}{2n+\frac1{1-\gamma}-2}\le
\sum_{i=1}^n\frac1i-\ln n-\gamma<\frac{1}{2n+\frac13}, $ where
$\gamma=0.57721566490153286...m$ denotes Euler's constant. The constants
$\frac{1}{1-\gamma}-2$ and $\frac13$ are the best possible. As by-products, two
double inequalities of the digamma and trigamma functions are established.
Chen Chao-Ping
Qi Feng
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