From 4a476d6fd20419c2a4bbf7fc82186ad28b65bd7d Mon Sep 17 00:00:00 2001
From: Shuhao Zhang <studyingfather@gmail.com>
Date: Sat, 10 Oct 2020 16:56:21 +0800
Subject: [PATCH] fix(stirling): fix typo

---
 docs/math/stirling.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/math/stirling.md b/docs/math/stirling.md
index 503c65a0..78f5d3a7 100644
--- a/docs/math/stirling.md
+++ b/docs/math/stirling.md
@@ -60,7 +60,7 @@ $$
 
 ### 下降幂与普通幂的相互转化
 
-我们记下降阶乘幂 $x^{\underline{n}}=\dfrac{x!}{(x-n)!}=\prod_{k=0}^n-1 (x-k)$ 。
+我们记下降阶乘幂 $x^{\underline{n}}=\dfrac{x!}{(x-n)!}=\prod_{k=0}^{n-1} (x-k)$ 。
 
 则可以利用下面的恒等式将普通幂转化为下降幂：
 
-- 
2.11.0