A refinement of Ramanujan's factorial approximation

被引:17
|
作者
Hirschhorn, Michael D. [1 ]
Villarino, Mark B. [2 ]
机构
[1] Univ New S Wales, Sch Math & Stat, Sydney, NSW 2052, Australia
[2] Univ Costa Rica, Escuela Matemat, San Jose 11501, Costa Rica
关键词
Ramanujan; Stirling's formula; GAMMA FUNCTION;
D O I
10.1007/s11139-013-9494-y
中图分类号
O1 [数学];
学科分类号
0701 ; 070101 ;
摘要
We present a new proof of the monotonicity of the correction term theta(n) in Ramanujan's refinement of Stirling's formula. Moreover we prove that theta(n) is concave.
引用
收藏
页码:73 / 81
页数:9
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