Comment #20 on issue 1263 by smichr: Invalid movement of roots across
fractions
http://code.google.com/p/sympy/issues/detail?id=1263
re 18: I must have put the test in from XFAIL wrong. Thanks for catching
that.
This issue is so ironic. I was just looking at Mul the other day trying to
think if
it migh tbe preferable to (like simplification of 1+x+2 to x+3) to just
split all
exponents out so x*(y+z) -> x**y*x**z. I think it's a good idea but gave up
since
there's enough work just sifting out the current work of 1766. But it
nagged at me
that there was handling of powers in there that might be breaking rules.
I'm now
looking into the problem where sqrt(z)/z -> 1/sqrt(z) which I think is a
problem in
flatten.
Also, Pow.as_base_exp() doesn't check to see if the base.q is positive
before
simplifying sqrt(1/z) to 1/sqrt(z).
So as far as I can see, those are the (hopefully) last two places where
this problem
is existing in 1766. (i.e. once those two problems are fixed in 1766 I
think this
error will have been erradicated; there are other errors in master related
to this
that have been fixed in 1766.)
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