# A variant theory for the Gorenstein flat dimension

Colloquium Mathematicae (2015)

- Volume: 140, Issue: 2, page 183-204
- ISSN: 0010-1354

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topSamir Bouchiba. "A variant theory for the Gorenstein flat dimension." Colloquium Mathematicae 140.2 (2015): 183-204. <http://eudml.org/doc/284108>.

@article{SamirBouchiba2015,

abstract = {This paper discusses a variant theory for the Gorenstein flat dimension. Actually, since it is not yet known whether the category (R) of Gorenstein flat modules over a ring R is projectively resolving or not, it appears legitimate to seek alternate ways of measuring the Gorenstein flat dimension of modules which coincide with the usual one in the case where (R) is projectively resolving, on the one hand, and present nice behavior for an arbitrary ring R, on the other. In this paper, we introduce and study one of these candidates called the generalized Gorenstein flat dimension of a module M and denoted by $GGfd_\{R\}(M)$ via considering exact sequences of modules of finite flat dimension. The new entity stems naturally from the very definition of Gorenstein flat modules. It turns out that the generalized Gorenstein flat dimension enjoys nice behavior in the general setting. First, for each R-module M, we prove that $GGfd_\{R\}(M) = Gid_\{R\}(Hom_\{ℤ\} (M,ℚ /ℤ))$ whenever $GGf_\{R\}(M)$ is finite. Also, we show that (R) is projectively resolving if and only if the Gorenstein flat dimension and the generalized Gorenstein flat dimension coincide. In particular, if R is a right coherent ring, then $GGfd_\{R\}(M) = Gfd_\{R\}(M)$ for any R-module M. Moreover, the global dimension associated to the generalized Gorenstein flat dimension, called the generalized Gorenstein weak global dimension and denoted by GG-wgldim(R), turns out to be the best counterpart of the classical weak global dimension in Gorenstein homological algebra. In fact, it is left-right symmetric and it is related to the cohomological invariants r-sfli(R) and l-sfli(R) by the formula
GG-wgldim(R) = maxr-sfli(R),l-sfli(R).},

author = {Samir Bouchiba},

journal = {Colloquium Mathematicae},

keywords = {copure flat dimension; GF-closed rings; generalized Gorenstein flat dimension; Gorenstein flat modules; generalized Gorenstein weak global dimension; Gorenstein injective dimension},

language = {eng},

number = {2},

pages = {183-204},

title = {A variant theory for the Gorenstein flat dimension},

url = {http://eudml.org/doc/284108},

volume = {140},

year = {2015},

}

TY - JOUR

AU - Samir Bouchiba

TI - A variant theory for the Gorenstein flat dimension

JO - Colloquium Mathematicae

PY - 2015

VL - 140

IS - 2

SP - 183

EP - 204

AB - This paper discusses a variant theory for the Gorenstein flat dimension. Actually, since it is not yet known whether the category (R) of Gorenstein flat modules over a ring R is projectively resolving or not, it appears legitimate to seek alternate ways of measuring the Gorenstein flat dimension of modules which coincide with the usual one in the case where (R) is projectively resolving, on the one hand, and present nice behavior for an arbitrary ring R, on the other. In this paper, we introduce and study one of these candidates called the generalized Gorenstein flat dimension of a module M and denoted by $GGfd_{R}(M)$ via considering exact sequences of modules of finite flat dimension. The new entity stems naturally from the very definition of Gorenstein flat modules. It turns out that the generalized Gorenstein flat dimension enjoys nice behavior in the general setting. First, for each R-module M, we prove that $GGfd_{R}(M) = Gid_{R}(Hom_{ℤ} (M,ℚ /ℤ))$ whenever $GGf_{R}(M)$ is finite. Also, we show that (R) is projectively resolving if and only if the Gorenstein flat dimension and the generalized Gorenstein flat dimension coincide. In particular, if R is a right coherent ring, then $GGfd_{R}(M) = Gfd_{R}(M)$ for any R-module M. Moreover, the global dimension associated to the generalized Gorenstein flat dimension, called the generalized Gorenstein weak global dimension and denoted by GG-wgldim(R), turns out to be the best counterpart of the classical weak global dimension in Gorenstein homological algebra. In fact, it is left-right symmetric and it is related to the cohomological invariants r-sfli(R) and l-sfli(R) by the formula
GG-wgldim(R) = maxr-sfli(R),l-sfli(R).

LA - eng

KW - copure flat dimension; GF-closed rings; generalized Gorenstein flat dimension; Gorenstein flat modules; generalized Gorenstein weak global dimension; Gorenstein injective dimension

UR - http://eudml.org/doc/284108

ER -

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