Comment #6 on issue 3135 by avichal....@gmail.com: Multiple series expansions
http://code.google.com/p/sympy/issues/detail?id=3135

Multivariate order is a bit unclear to me.
I did read the Wikipedia article and I guess the following is causing the bug.

In the given example I expect the Order term is:-
Order(y**6*x**5 + y**6*x**4 + ...) which simplifies to Order(y**6).
However is it expected to simplify to Order(y**6*x**5).
This is because by default Order assumes that variables tend to zero. Shouldn't by default be infinity?

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