Comment #7 on issue 2179 by ronan.l...@gmail.com: Lambda refactoring
http://code.google.com/p/sympy/issues/detail?id=2179
There's another change in my branch that I should have mentioned before:
The arguments of the Lambda must now be wrapped in an iterable, so
Lambda(x, y, x*y) must now be written Lambda((x, y), x*y). I think this
isn't a big break of compatibility. The advantage of doing that is that it
clarifies the code and allows nullary Lambdas (I'm not sure the latter is
terribly useful but at least S('lambda : 1') now returns a sensible result).
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