以一个例子为导入,给出Abel范畴中的Fitting引理、Krull-Schmidt定理的简单证明,进而得出k-Abel范畴中有限长度的不可分解对象的自同态环的计算公式.
Start with one interesting example, and then put forward and prove in brief the Fit- ting lemma and the Krull-Schmidt theorem for Abelian categories. Finally, the calculation formula for endomorphism rings of finite length indecomposable objects in k -Abelian categories is presented.