I am looking for an approximation/bound for the incomplete Beta function $B_z(a,b)$ when $z\to0$. I know the Taylor expansion would help. However, I need a power series in $z^n$ (the exponential is an integral)rather than $x^{n-a}$. Or, is there any other ways to approximate or find an effective bound for $B_z(a,b)$?
2026-03-25 15:10:49.1774451449
Incomplete Beta function
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