Comment #5 on issue 2992 by [email protected]: add removable_discontinuity flag to 'solve' because check=False produces wrong answers
http://code.google.com/p/sympy/issues/detail?id=2992
What would be the algorithm? The way that I would do it would be to check if direct substitution gives nan, but that could be flaky (what if it doesn't reduce to nan (complicated solutions)?, what if nan is somehow passed over and it gives the solution with the discontinuity removed?, what if the original expression already had nan in it?).
Or is there an easier way to do it? Maybe as_numer_denom and check it the solution also makes the denom go to zero?
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