3
$\begingroup$

Let $R$ be a commutative ring with $1$ such that every ideal containing $J(R)$, the intersection of all maximal ideals, is an intersection of maximal ideals. Is there any characterization for such a ring or is there any geometric interpretation for this property?

$\endgroup$

1 Answer 1

7
$\begingroup$

The condition is equivalent to $R/J$ being von Neumann regular.

Set $S = R/J$. Then the condition requires that no factor of $S$ have any nilpotent elements, and thus the square of any ideal in $S$ is the ideal itself. In particular, $rS = (rS)^2 = r^2 S$ for all $r \in S$, and thus $r = r^2 x$ for some $x \in S$, proving $S$ is regular. The converse is trivial.

$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.