Mathematics – Commutative Algebra
Scientific paper
2004-06-21
Mathematics
Commutative Algebra
Scientific paper
We develop techniques for computing the AK invariant of domains with
arbitrary characteristic. As an example, we show that for any field $K$ the
ring $K[X,Y,Z,T] / (X + X^2 Y + Z^2 + T^3)$ is not isomorphic to a polynomial
ring over $K$.
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