Updates:
Status: Accepted
Labels: -NeedsReview -smichr
Comment #4 on issue 2981 by krastano...@gmail.com: document the "check"
option of solve()
http://code.google.com/p/sympy/issues/detail?id=2981
It was a typo but a typo in the other direction (I think). sin(x)/x is
equal to one at x=0. What was in solve() should have been sin(x)/x-1
So we must have:
solve(sin(x)/x) >> []
solve(sin(x)/x, check=False) >> [] # in master this wrongly gives [0]
solve(sin(x)/x - 1) >> [] # NotImplemented
solve(sin(x)/x - 1, check=False) >> [0] # NotImplemented
There are two issues here. The documentation should make it clear if check
causes that type of errors instead of producing correct answer. (this is
the current issue)
At the moment check=True produces correct answers (near the zero) if
expr=O(x)/O(1). check=False helps to find correct answers when
expr=O(x**p)/O(x**q) if p>q but produces incorrect answers if p<=q.
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