Comment #2 on issue 2614 by [email protected]: Wrong usage of Atom in sympy.physics.quantum
http://code.google.com/p/sympy/issues/detail?id=2614
This one is on me, I wasn't aware of the full implications of Atomic when I made the WignerD class, and so it subclasses AtomicExpr instead of Expr in the current master. It is fixed in my coupled_spin branch, which will be coming up on merging soon; if a fix is needed sooner, making a pull to fix it would be trivial.
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