Comment #1 on issue 2442 by ronan.l...@gmail.com: Why does Lambda use Dummys?
http://code.google.com/p/sympy/issues/detail?id=2442
Lambda(x, x) is Lambda(y, y) is S.IdentityFunction, so there is no way it can remember the original symbol name. But Lambda(y, 2*y) does remember it, which causes problems because equal objects behave differently for printing, cf. issue 2440.
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