Comment #26 on issue 2552 by [email protected]: (1/(x*y)).subs(x*y, whatever)
doesn't work
http://code.google.com/p/sympy/issues/detail?id=2552
It my master it is already gives:
(1/(x*y)).as_base_exp()
(x*y, -1)
Also, if by 'implicit substitution' you mean internally treating
`subs(x*y, foo)` as `subs(x, foo/y)`
No, by 'implicit substitution' I mean the situation, when we not just
simply parse the expression as the pure symbolic tree, but apply
mathematics somehow.
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