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A Linear Counterexample to the Fourteenth Problem of Hilbert in Dimension ElevenGENE FREUDENBURG20002 Excerpts

A counterexample to H ilbert’s fourteenth problem in dimension fiveD. Daigle, G. FreudenburgJ. of Algebra19992 Excerpts

Differential structure of etale extensions of polynomial algebras, Com mutative Algebra (MH. BassSpringer-verlag, New York,19892 Excerpts