Updates:
Labels: -Priority-High Priority-Medium
Comment #10 on issue 978 by [email protected]: extract (-1) from all
expressions canonically
http://code.google.com/p/sympy/issues/detail?id=978
I'll leave this open and reduce the priority for two reasons;
1) although we now have signsimp() and it's part of simplify, this
simplification should probably be part of the canonicalization process
2) could_extract_minus_sign returns True for an Add if there are more
negative terms than positive terms; this could perhaps be written so that
the first term shows up as positive (as was suggested in the OP).
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