A module Mis called generalized extending if for any submodule N of M, there is a direct summand K of M such that N≤K and KIN is singular. Any extending module and any singular module are generalized extending. Any h...A module Mis called generalized extending if for any submodule N of M, there is a direct summand K of M such that N≤K and KIN is singular. Any extending module and any singular module are generalized extending. Any homomorphic image of a generalized extending module is generalized extending. Any direct sum of a singular (uniform) module and a semi-simple module is generalized extending. A ring R is a right Co-H-ring if and only if all right R modules are generalized extending modules.展开更多
The concept of derivations and generalized inner derivations has been generalized as an additive function δ: R → R satisfying δ (xy) = δ(x)y+xd(y) for all x, y ∈ R, where d is a derivation on R. Such a fu...The concept of derivations and generalized inner derivations has been generalized as an additive function δ: R → R satisfying δ (xy) = δ(x)y+xd(y) for all x, y ∈ R, where d is a derivation on R. Such a function δ is called a generalized derivation. Suppose that U is a Lie ideal of R such that u^2 ∈ U for all u ∈ U. In this paper, we prove that U lahtain in Z(R) when one of the following holds: (1) δ([u, v]) = u o v =(2) δ([u,v])=[u o v] = 0 (3) δ(u o v) = [u, v] (4) δ(u o v)+δ[u, v] = 0 for all u, v ∈ U.展开更多
基金Project (No. 102028) supported by the Natural Science Foundation of Zhejiang Province, China
文摘A module Mis called generalized extending if for any submodule N of M, there is a direct summand K of M such that N≤K and KIN is singular. Any extending module and any singular module are generalized extending. Any homomorphic image of a generalized extending module is generalized extending. Any direct sum of a singular (uniform) module and a semi-simple module is generalized extending. A ring R is a right Co-H-ring if and only if all right R modules are generalized extending modules.
文摘The concept of derivations and generalized inner derivations has been generalized as an additive function δ: R → R satisfying δ (xy) = δ(x)y+xd(y) for all x, y ∈ R, where d is a derivation on R. Such a function δ is called a generalized derivation. Suppose that U is a Lie ideal of R such that u^2 ∈ U for all u ∈ U. In this paper, we prove that U lahtain in Z(R) when one of the following holds: (1) δ([u, v]) = u o v =(2) δ([u,v])=[u o v] = 0 (3) δ(u o v) = [u, v] (4) δ(u o v)+δ[u, v] = 0 for all u, v ∈ U.