Comment #10 on issue 4108 by [email protected]: Order at oo is wrong
http://code.google.com/p/sympy/issues/detail?id=4108
This seems sufficient:
diff --git a/sympy/series/order.py b/sympy/series/order.py
index a981f48..7c15d47 100644
--- a/sympy/series/order.py
+++ b/sympy/series/order.py
@@ -139,7 +139,8 @@ def __new__(cls, expr, *symbols):
expr = Add(*[f.expr for (e, f) in lst])
elif expr:
- expr = expr.as_leading_term(*symbols)
+ if point == S.Zero:
+ expr = expr.as_leading_term(*symbols)
expr = expr.as_independent(*symbols, as_Add=False)[1]
expr = expand_power_base(expr)
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