Comment #1 on issue 1976 by [email protected]: Add is_one attribute to Basic (or Expr)
http://code.google.com/p/sympy/issues/detail?id=1976
-1: I don't think this justifies adding an attribute to every object in sympy.
Rather than Poly(1, x).is_one, I would expect to see Poly(1, x) == S(1), or Poly(1, x) == some_ring.identity.
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