A refinement of Ramanujan's factorial approximation

作者：Hirschhorn Michael D; Villarino Mark B^*

来源：Ramanujan Journal, 2014, 34(1): 73-81.

DOI：10.1007/s11139-013-9494-y

• Ramanujan
• Stirling's formula

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.

• 出版日期2014-5