摘要
讨论了一种新的拉回形式 集体拉回,研究了它的性质以及它与拉回的关系,特别是在有积的范畴中。
This paper discusses the properties of collective pullback which is a new kind of pullback and the relation between collective pullback and pullback. In particular, collective pullback has close relation to pullback in category with product.
出处
《华中师范大学学报（自然科学版）》
CAS
CSCD
北大核心
1999年第4期476-479,共4页
Journal of Central China Normal University：Natural Sciences
关键词
范畴
集体拉回
拉回
积
category
collective pullback
pullback
product
