Comment #15 on issue 2151 by matt...@gmail.com: BasicMeta.keep_sign http://code.google.com/p/sympy/issues/detail?id=2151
I fixed all trivial test failures. Unfortunately, there there are three bugs that have to be fixed: in as_ordered_terms(), heurisch() (#1304) and checkodesol() (trigsimp() needed to simplify to zero).
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