Updates:
Cc: [email protected]
Comment #2 on issue 2480 by [email protected]: Lambda erases
assumptions on its variables
http://code.google.com/p/sympy/issues/detail?id=2480
Thinking a bit more, there are some details that need to be decided:
Lambda(x, x**2) == Lambda(y, y**2) if assumptions on x and y are different?
And if you assume the variable for Lambda is positive, then try to __call__
the Lambda with a negative argument, should it raise?
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