Verbally prime T-ideals and graded division algebras

Eli Aljadeff, Yaakov Karasik*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Let F be an algebraically closed field of characteristic zero and let G be a finite group. We consider graded Verbally prime T-ideals in the free G-graded algebra. It turns out that equivalent definitions in the ordinary case (i.e. ungraded) extend to nonequivalent definitions in the graded case, namely verbally prime G-graded T-ideals and strongly verbally prime T-ideals. At first, following Kemer's ideas, we classify G-graded verbally prime T-ideals. The main bulk of the paper is devoted to the stronger notion. We classify G-graded strongly verbally prime T-ideals which are T-ideal of affine G-graded algebras or equivalently G-graded T-ideals that contain a Capelli polynomial. It turns out that these are precisely the T-ideal of G-graded identities of finite dimensional G-graded, central over F (i.e. Z(A)e=F) which admit a G-graded division algebra twisted form over a field k which contains F or equivalently over a field k which contains enough roots of unity (e.g. a primitive n-root of unity where n=ord(G)).

Original languageEnglish
Pages (from-to)142-175
Number of pages34
JournalAdvances in Mathematics
StatePublished - 9 Jul 2018
Externally publishedYes


  • Graded algebras
  • Graded division algebras
  • Polynomial identities
  • Verbally prime


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