Comment #10 on issue 1113 by abhishek...@gmail.com: rewrite sign(x) (and
possibly abs()) using Piecewise
http://code.google.com/p/sympy/issues/detail?id=1113
hi
it means some type of redefinition of abs(x) required because piecewise
functions are working well. Can I begin working on this patch as my first
patch?
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