Let $R$ be a commutative ring with unity whose prime spectrum is both Noetherian and Artinian under Zariski topology i.e. $R$ satisfies a.c.c. and d.c.c. on radical ideals. Then is it true that $R$ has dimension zero ? If this is not true in general, is it true if we further assume $R$ is local ?

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    $\begingroup$ @user26857: Thanks for making my case in your comment ... $\endgroup$ – user640299 Feb 20 '19 at 21:08
  • $\begingroup$ My apologies, close vote retracted. $\endgroup$ – KReiser Feb 20 '19 at 21:10

No. For instance, any finite topological space is trivially both Noetherian and Artinian, but need not be zero-dimensional. Explicitly, for instance, if $R$ is a discrete valuation ring then its spectrum has two points but is not zero-dimensional.

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