关于F^A_R—模范畴中束和与束积的几点注记

Some Notes about Pull-outs and Pull-backs in the Category of F^A_R-Module

本文引进了FAR—模范畴中束和、束积的概念，给出了束和、束积的若干性质，并通过具体例子说明了FAR．—模范畴中的束和、束积与R—模范畴中束和、束积的某些差异．

In this paper, we introduce the conceptes of pull-outs and pull-backs in the category of FAR module, and give some properties of them, and discuss the difference between the pull-outs and pull-backs in the category of FAR-module and the pull-out and pull-back in the category of R module.