… It is proven that a morphism f is an n-phantom morphism if and … ; A morphism g is an n-Ext-phantom
morphism if and only if … n-phantom morphisms by n and the ideal of n-Ext-phantom …

… based on phantom envelopes and Ext-phantom covers of … replacing phantom and Ext-phantom
with n-phantom and n-… of n-phantom morphism [14], which is a higher dimensional …

… We call such a morphism f, as an n-Ext-phantom morphism. In Section 7, we introduce a
composition operator “◦” on Extn /P. It is shown that this operator is associative and distributive …

… right module A and α is said to be an n-Ext-phantom if Extn(A, α) is 0 for every … phantom
(resp., a 1-Ext-phantom) morphism if and only if α is a phantom (resp., an Ext-phantom) morphism…

… Ext-phantom morphisms are also called cophantom morphisms in [14]. … We note that the
existence of Ext-phantom preenvelopes is a special case of [14, Theorems 32 and 33]. In Sect. 2 …

… cophantom morphism or Ext-phantom morphism [15, 22] if the induced … morphism versions
of flat and absolutely pure modules. We have known that phantom and cophantom morphisms …

… of n-phantom morphisms and n-Ext-phantom morphisms. Journal of … the n-phantom and
n-Ext-phantom of morphisms in short … ) and their character morphisms has been investigated. …

… the concepts of (nꎬd)-phantom and (nꎬd)-Ext-phantom morphismsꎬ and give their some …
Covering ideals of morphisms and module representations of the quiver A2 [J]. J Pure Appl …

… Phantom-态射与Ext-phantom-态射的定义最早是来自于文献[2-… 下面讨论n-phantom-态射与
Torn -单态射以及n-Ext-phantom-态射… Higher phantom morphisms with respect to a subfunctor of …

… Higher phantom morphisms with respect to a subfunctor of Ext[J]. Algebra Represent Theorꎬ
2019ꎬ … Higher phantom and Ext-phantom morphisms[J]. J Algebra Applꎬ 2018ꎬ 17:1-15. …