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NAKAYAMA AUTOMORPHISMS OF ORE EXTENSIONS OVER POLYNOMIAL ALGEBRAS

Published online by Cambridge University Press:  17 June 2019

LIYU LIU
Affiliation:
School of Mathematical Sciences, Yangzhou University, No. 180 Siwangting Road, 225002 Yangzhou, Jiangsu, China e-mail: [email protected]; [email protected]
WEN MA
Affiliation:
School of Mathematical Sciences, Yangzhou University, No. 180 Siwangting Road, 225002 Yangzhou, Jiangsu, China e-mail: [email protected]; [email protected]

Abstract

Nakayama automorphisms play an important role in the fields of noncommutative algebraic geometry and noncommutative invariant theory. However, their computations are not easy in general. We compute the Nakayama automorphism ν of an Ore extension R[x; σ, δ] over a polynomial algebra R in n variables for an arbitrary n. The formula of ν is obtained explicitly. When σ is not the identity map, the invariant EG is also investigated in terms of Zhang’s twist, where G is a cyclic group sharing the same order with σ.

Type
Research Article
Copyright
© Glasgow Mathematical Journal Trust 2019

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