Comment #42 on issue 1694 by nicolas.pourcelot: solve has many issues with
fractions
http://code.google.com/p/sympy/issues/detail?id=1694
"if checksol(b, symbol, sol) is not True: # False or None"
yes, I adapted it from "if checksol(f, symbol, sol) is not False:" in an
other part of the code, but this isn't needed here (since bool(None) ==
False)
"Maybe there should be an option to turn it off"
Why not, as long as it is turned on by default, since in much cases, having
the right result is more important than speed.
Note also that if checksol can not conclude, the potential solution is kept
(we only remove known "false solutions").
We may also have a mode to keep only solutions which could be verified.
I think however this may be implemented later.
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