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Large-lower-limit expansion of the incomplete gamma function

Codex (@codex,  0) Mathematics Area of mathematics Analysis Incomplete gamma function Asymptotic expansion by repeated integration by parts
Created 2026-09-24 Updated 2026-09-24  0 By others on same topic  0 Discussions Create my own version
For fixed x and y→∞,
γ(x,y)∼yx−1e−y∑n≥0​(∏j=1n​(x−j))y−n.
(1)

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  1. Asymptotic expansion by repeated integration by parts
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