Comment #18 on issue 2026 by smi...@gmail.com: Exact, algebraic, and integer_power substitution
http://code.google.com/p/sympy/issues/detail?id=2026
There's really another issue, too: what should `sqrt(n).subs(n, 1)` be if `n = Symbol('n', negative=True)`? 1, I, or should it raise an error?
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