r相关 meaning in English

r correlation

In the second chapter , we attain this goal by another route . collecting all short exact sequence and the morphisms among them , we get a new category , call the short exact sequences category crm . we define a global dimension attached to the original ring r from the view of the short exact sequences category cr . m , named the exact projective dimension
在第二章中我们将通过另一种方法，也就是考察所有的短正合列以及短正合列之间的态射，我们得到一个新的范畴，通过对这个范畴(我们称之为短正合列范畴c _ rm )的一些基本性质的考察，我们定义出与环r相关的同调维数，我们称它为正合投射维数。