摘要: 设C是一个E-三角范畴,
ξ是C中的一个E-三角真类。在C中引入(
n,
m)-强
ξ-Gorenstein投射对象的概念,研究了C中的对象与其合冲的这种
ξ-Gorenstein投射性质之间的联系。作为应用,证明了
ξ中对象
X的
ξ-Gorenstein投射维数小于等于
m当且仅当存在C中的
ξ-Gorenstein投射对象
G,使得

是(1,
m)-强
ξ-Gorenstein投射的。
Abstract:
Let C be an extriangulated category and
ξ a proper class of E-triangles of C. The notion of (
n,
m)- strongly
ξ-Gorenstein projective object in C is introduced and the relation of such
ξ-Gorenstein projectivity of an object in C with that of its syzygies is investigated. As a consequence, it is shown that an object
X of C has
ξ-Gorenstein projective dimension at most
m if and only if

is (1,
m)-strongly
ξ-Gorenstein projective for some
ξ-Gorenstein projective object of C.