Index: numeric.cpp
===================================================================
RCS file: /home/cvs/GiNaC/ginac/numeric.cpp,v
retrieving revision 1.114
diff -u -r1.114 numeric.cpp
--- numeric.cpp	29 Jun 2005 14:09:24 -0000	1.114
+++ numeric.cpp	9 Nov 2005 14:46:29 -0000
@@ -631,9 +631,15 @@
 	const numeric &o = ex_to<numeric>(other);
 	if (this->is_equal(o) || this->is_equal(-o))
 		return true;
-	if (o.imag().is_zero())  // e.g. scan for 3 in -3*I
-		return (this->real().is_equal(o) || this->imag().is_equal(o) ||
-		        this->real().is_equal(-o) || this->imag().is_equal(-o));
+	if (o.imag().is_zero()) {   // e.g. scan for 3 in -3*I
+		if(!this->real().is_equal(*_num0_p))
+			if(this->real().is_equal(o) || this->real().is_equal(-o))
+				return true;
+		if(!this->imag().is_equal(*_num0_p))
+			if(this->imag().is_equal(o) || this->imag().is_equal(-o))
+				return true;
+		return false;
+	}
 	else {
 		if (o.is_equal(I))  // e.g scan for I in 42*I
 			return !this->is_real();