Status: Accepted
Owner: ----
Labels: Type-Defect Priority-Medium smichr NeedsReview

New issue 2804 by [email protected]: could_extract_minus_sign should look in the denominator
http://code.google.com/p/sympy/issues/detail?id=2804

After this commit, the following gives True

    >>> (-(x-y)).could_extract_minus_sign()
    True
    >>> (1/(-(x-y))).could_extract_minus_sign()
    False

The unhealthy dependence on extract_multiplicatively has been removed and a more transparent approach is taken.

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