Comment #28 on issue 1337 by Vinzent.Steinberg: find all instances in an expression
http://code.google.com/p/sympy/issues/detail?id=1337
I like it. This way, subs() would be very basic and fast, whereas replace() can do the advanced stuff. replace() reminds me of rewrite().
Sebastian created several versions of subs, some much faster than our current implementation, but it never got in IIRC.
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