From 971dc53f0ede0945dda9471596e4c727ea23dc7c Mon Sep 17 00:00:00 2001
From: Guido van Rossum <guido@python.org>
Date: Thu, 20 Oct 1994 22:02:03 +0000
Subject: [PATCH] fix bug in poly.minus

---
 Lib/poly.py | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/Lib/poly.py b/Lib/poly.py
index 3a21904c18d..57bd2032d4c 100644
--- a/Lib/poly.py
+++ b/Lib/poly.py
@@ -20,11 +20,8 @@ def plus(a, b):
 	return normalize(res)
 
 def minus(a, b):
-	if len(a) < len(b): a, b = b, a # make sure a is the longest
-	res = a[:] # make a copy
-	for i in range(len(b)):
-		res[i] = res[i] - b[i]
-	return normalize(res)
+	neg_b = map(lambda x: -x, b[:])
+	return plus(a, neg_b)
 
 def one(power, coeff): # Representation of coeff * x**power
 	res = []