一般情况下,预Abel范畴中余核的拉回未必是余核.给出反例,讨论了预Abel范畴中余核的拉回是余核的几个条件.
In general, the pull-back of a cokemel alone any morphism is not a cokernel in pre- Abelian categories. Firstly illustrate a counter-example, and then investigate several conditions that the pull-back of a cokernel alone any morphism is a cokernel in pre-Abelian categories.