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$G$-identities on associative algebras
Proceedings of the American Mathematical Society
Let R be an algebra over a field and G a finite group of automorphisms and anti-automorphisms of R. We prove that if R satisfies an essential G-polynomial identity of degree d, then the G-codimensions of R are exponentially bounded and R satisfies a polynomial identity whose degree is bounded by an explicit function of d. As a consequence we show that if R is an algebra with involution * satisfying a * -polynomial identity of degree d, then the * -codimensions of R are exponentially bounded;doi:10.1090/s0002-9939-99-04530-x fatcat:46a6agln7bakzpavwntorkrm5y