Please help me to find a reference (book) for the following upper bound of Gamma function
For $x \geq 1$ $$ \Gamma(x)\leq x^{x-1}. $$
Thank you.
2026-04-08 22:37:43.1775687863
reference needed for Gamma function
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Does it have to be a book? Here is the original paper (Anderson and Qiu 1997).