Co-stability of Radicals and Its Applications to PI-Theory  

作　　者：A.S. Gordienko 

机构地区：[1]Vrije Universiteit Brussel, Belgium

出　　处：《Algebra Colloquium》2016年第3期481-492,共12页代数集刊（英文版）

摘　　要：We prove that if A is a finite-dimensional associative H-comodule algebra over a field F for some involutory Hopf algebra H not necessarily finite-dimensional, where either char F = 0 or char F 〉 dim A, then the Jacobson radical J（A） is an H-subcomodule of A. In particular, if A is a finite-dimensional associative Mgebra over such a field F, graded by any group, then the Jacobson radical J（A） is a graded ideal of A. Analogous results hold for nilpotent and solvable radicals of finite-dimensional Lie algebras over a field of characteristic 0. We use the results obtained to prove the analog of Amitsur＇s conjecture for graded polynomial identities of finite-dimensional associative algebras over a field of characteristic 0, graded by any group. In addition, we provide a criterion for graded simplicity of an associative algebra in terms of graded codimensions.We prove that if A is a finite-dimensional associative H-comodule algebra over a field F for some involutory Hopf algebra H not necessarily finite-dimensional, where either char F = 0 or char F 〉 dim A, then the Jacobson radical J（A） is an H-subcomodule of A. In particular, if A is a finite-dimensional associative Mgebra over such a field F, graded by any group, then the Jacobson radical J（A） is a graded ideal of A. Analogous results hold for nilpotent and solvable radicals of finite-dimensional Lie algebras over a field of characteristic 0. We use the results obtained to prove the analog of Amitsur＇s conjecture for graded polynomial identities of finite-dimensional associative algebras over a field of characteristic 0, graded by any group. In addition, we provide a criterion for graded simplicity of an associative algebra in terms of graded codimensions.

关 键 词：RADICALS polynomial identity GRADING H-comodule algebra CODIMENSION 

分 类 号：O621.146[理学—有机化学] TQ323.7[理学—化学]