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Left Jacobson rings
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DOI：10.1016/j.jalgebra.2026.03.002.png)
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Abstract
En 中文
We say that a ring is strongly (resp. weakly) left Jacobson if every semiprime (resp. prime) left ideal is an intersection of maximal left ideals. There exist Jacobson rings that are not weakly left Jacobson, e.g. the Weyl algebra. Our main result is the following one-sided noncommutative Nullstellensatz: For any finite-dimensional F-algebra A the ring A[x1, ... , xn] of polynomials with coefficients in A is strongly left Jacobson and every maximal left ideal of A[x1, ... , xn] has finite codimension. We also prove that an Azumaya algebra is strongly left Jacobson iff its center is Jacobson and that an algebra that is a finitely generated module over its center is weakly left Jacobson iff it is Jacobson. (c) 2026 The Authors. Published by Elsevier Inc. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
Keywords:
Nullstellensatz
Noncommutative geometry
Maximal left ideals
Jacobson ring
Azumaya algebra
Weyl algebra