Status: Accepted
Owner: [email protected]
Labels: Type-Defect Priority-Medium
New issue 2178 by [email protected]: A singleton object for the identity
function
http://code.google.com/p/sympy/issues/detail?id=2178
The identity function (i.e. Lambda(x, x)) is a mathematically important
object, so it would be convenient to have it as a singleton, called S.Id
maybe. It's also required, IMO, in order to implement properly RootSum() in
polys12.
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