Title of article :
On the cofiniteness of local cohomology modules
Author/Authors :
Roshan-Shekalgourabi, Hajar Department of Basic Sciences - Arak University of Technology, Arak, Iran
Abstract :
Let be a commutative Noetherian ring with identity, be an ideal of and be an -module such that
is finitely generated for all . We prove that if
for all , then for any and for any submodule of
that is either -cofinite or minimax, the -module
is -cofinite. This generalizes the main result of Bahmanpour and Naghipour [8, Theorem 2.6]. As a consequence, the Bass numbers and Betti numbers of
are finite for all . Also, among other things, we show that if either or , then for each finitely generated -module , the -module
is -weakly cofinite, for all and . This generalizes [1, Corollary 2.8].
Keywords :
Local cohomology modules , cofinite modules , Minimax modules , Weakly Laskerian modules , Krull dimension , Bass numbers
Journal title :
Journal of Algebraic Structures and Their Applications