From 2893c8e04685b99317384ff02a0fefc899f499f9 Mon Sep 17 00:00:00 2001
From: Chris Dams <Chris.Dams@mi.infn.it>
Date: Tue, 4 Apr 2006 14:11:21 +0000
Subject: [PATCH] Fix bug in differentiation of a power.

---
 ginac/power.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ginac/power.cpp b/ginac/power.cpp
index 95a01ace..0ebc8dc2 100644
--- a/ginac/power.cpp
+++ b/ginac/power.cpp
@@ -620,7 +620,7 @@ ex power::conjugate() const
  *  @see ex::diff */
 ex power::derivative(const symbol & s) const
 {
-	if (exponent.info(info_flags::real)) {
+	if (is_a<numeric>(exponent)) {
 		// D(b^r) = r * b^(r-1) * D(b) (faster than the formula below)
 		epvector newseq;
 		newseq.reserve(2);
-- 
2.44.0