Comment #13 on issue 1113 by asmeu...@gmail.com: rewrite sign(x) (and
possibly abs()) using Piecewise
http://code.google.com/p/sympy/issues/detail?id=1113
One major issue with integrals containing absolute values is the way we
represent the derivative of abs(x). For real x, it comes out as sign(x),
which I think would work in heurisch if that were then rewritten as
abs(x)/x. This also is related to an issue that has come up before of
letting functions define separate forms of derivatives to be used by
heurisch than are used by everything else.
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