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A generalization of the finiteness problem of the local cohomology modules

Ahmad AbbasiHajar Roshan-Shekalgourabi — 2014

Czechoslovak Mathematical Journal

Let R be a commutative Noetherian ring and 𝔞 an ideal of R . We introduce the concept of 𝔞 -weakly Laskerian R -modules, and we show that if M is an 𝔞 -weakly Laskerian R -module and s is a non-negative integer such that Ext R j ( R / 𝔞 , H 𝔞 i ( M ) ) is 𝔞 -weakly Laskerian for all i < s and all j , then for any 𝔞 -weakly Laskerian submodule X of H 𝔞 s ( M ) , the R -module Hom R ( R / 𝔞 , H 𝔞 s ( M ) / X ) is 𝔞 -weakly Laskerian. In particular, the set of associated primes of H 𝔞 s ( M ) / X is finite. As a consequence, it follows that if M is a finitely generated R -module and N is an 𝔞 -weakly...

Some results on the local cohomology of minimax modules

Ahmad AbbasiHajar Roshan-ShekalgourabiDawood Hassanzadeh-Lelekaami — 2014

Czechoslovak Mathematical Journal

Let R be a commutative Noetherian ring with identity and I an ideal of R . It is shown that, if M is a non-zero minimax R -module such that dim Supp H I i ( M ) 1 for all i , then the R -module H I i ( M ) is I -cominimax for all i . In fact, H I i ( M ) is I -cofinite for all i 1 . Also, we prove that for a weakly Laskerian R -module M , if R is local and t is a non-negative integer such that dim Supp H I i ( M ) 2 for all i < t , then Ext R j ( R / I , H I i ( M ) ) and Hom R ( R / I , H I t ( M ) ) are weakly Laskerian for all i < t and all j 0 . As a consequence, the set of associated primes of H I i ( M ) is finite for all i 0 , whenever dim R / I 2 and...

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