Mathematics – Commutative Algebra
Scientific paper
2009-08-26
Mathematics
Commutative Algebra
43 pages. In Proposition 25 (Statement 25), condition (3) was added. Propositions 26, 34 were added. For Proposition 31 (State
Scientific paper
We develop a geometric theory for difference equations with a given group of
automorphisms. To solve this problem we extend the class of difference fields
to the class of absolutely flat simple difference rings called pseudofields. We
prove the Nullstellensatz over pseudofields and investigate geometric
properties of pseudovarieties.
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