From 1f86b234ea08e3761d431e90d4b6f6bc4ad78337 Mon Sep 17 00:00:00 2001
From: Lafrite <lafrite@poneyworld.net>
Date: Tue, 23 Dec 2014 10:07:36 +0100
Subject: [PATCH] change str to self.STR_RENDER in Expression.simplify

---
 pymath/expression.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pymath/expression.py b/pymath/expression.py
index fd38bd4..b5cef2f 100644
--- a/pymath/expression.py
+++ b/pymath/expression.py
@@ -133,7 +133,7 @@ class Expression(object):
                 if new_s != old_s:
                     old_s = new_s
                     yield new_s
-            if old_s != str(self.child):
+            if old_s != self.STR_RENDER([self.child]):
                 yield self.STR_RENDER([self.child])