Comment #22 on issue 2440 by smi...@gmail.com: Equal Integrals compare
different when using different variables
http://code.google.com/p/sympy/issues/detail?id=2440
I see why this is a bad idea - the bound symbols only should be remapped,
not the others or else a cached result for one expression would be returned
for another, e.g. if x+y and a+b were squared, we want (x+y)**2 in one case
and (a+b)**2 in the other. If they were both hashed using _0+_1 then
whichever expression was squared first would also be the result when
squaring the other:
e1 = x+y
e2 = a+b
e1**2 -> (x+y)**2
e2**2 -> (x+y)**2 # if the squaring procedure were cached
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