Fixed IndexError in constant order multiplication.

Fixed sympy/sympy#9192 // edited by skirpichev
skirpichev · Jul 3, 2015 · 9bf622f · 9bf622f
1 parent 9c4a8ca
commit 9bf622f
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diff --git a/sympy/series/order.py b/sympy/series/order.py
@@ -275,7 +275,7 @@ def as_expr_variables(self, order_symbols):
                not all(p == self.point[0] for p in self.point):
                 raise NotImplementedError('Order at points other than 0 '
                     'or oo not supported, got %s as a point.' % point)
-            if order_symbols[0][1] != self.point[0]:
+            if order_symbols and order_symbols[0][1] != self.point[0]:
                 raise NotImplementedError(
                         "Multiplying Order at different points is not supported.")
             order_symbols = dict(order_symbols)

diff --git a/sympy/series/tests/test_order.py b/sympy/series/tests/test_order.py
@@ -415,3 +415,7 @@ def test_order_subs_limits():
 
 def test_issue_9351():
     assert exp(x).series(x, 10, 1) == exp(10) + Order(x - 10, (x, 10))
+
+
+def test_issue_9192():
+    assert O(1)*O(1) == O(1)