论文标题
关于自由代数和模块的理论的评论
Remarks on theories of free algebras and modules
论文作者
论文摘要
我们提出了一些问题,并对无限多数发生器中自由代数的(完整)理论t(Infinity,v)进行了一些观察,其中V是通用代数意义上的多种多样的。我们专注于t(infinity,r)的情况,其中v是r模块的种类(r a环)。在Kucera-Pillay的工作基础上,当所有T(Infinity,R)的所有型号都是免费的,投影,平坦的,以及T(Infinity,R)在更高的功率上是明确的时,我们将表征我们的特征。
We ask some questions and make some observations about the (complete) theory T (infinity, V) of free algebras in V on infinitely many generators, where V is a variety in the sense of universal algebra. We focus on the case T(infinity, R) where V is the variety of R-modules (R a ring). Building on work in Kucera-Pillay we characterize when all models of T(infinity, R) are free, projective, flat, as well as when T(infinity,R) is categorical in a higher power.