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6. Sub-division rings of the Weyl algebra


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      Problem 6.1.

      [James Zhang] Suppose that $D$ is a sub-division ring of $Q(A_1)$, where $A_1$ is the first Weyl algebra. Is it necessarily the case that either $D$ is isomorphic to $Q(A_1)$ or that $D$ is PI?

          Cite this as: AimPL: Noncommutative surfaces and Artin's conjecture, available at http://aimpl.org/ncsurfaceartin.