Status: Accepted
Owner: asmeurer
Labels: Type-Defect Priority-Medium Printing
New issue 2442 by asmeurer: Why does Lambda use Dummys?
http://code.google.com/p/sympy/issues/detail?id=2442
We have
In [19]: Lambda(x, x)
Out[19]: Lambda(_x, _x)
In [20]: Lambda(y, y)
Out[20]: Lambda(_x, _x)
The _x is a Dummy, which automatically replaces the given variable. Why is
this done? I know that we need to be able to compare essentially equal
Lambdas as equal with ==, but that can be done equally as well with the
original symbol as with a Dummy. On the other hand, if we use the original
symbol, we get nicer printing.
Also, there is an inconsistency with multiple symbols, and a printing bug:
In [22]: Lambda((x, y), y)
Out[22]: Lambda((_x, _y), _y
In [23]: Lambda((x, z), y)
Out[23]: Lambda((_x, _z), y
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