BIFUNLTORS AND THE DIAGONAL EXACT SEQUENCES OF A CYLINDER-WEB DIAGRAM
作者:
K.A. Hardie,
期刊:
Quaestiones Mathematicae
(Taylor Available online 1979)
卷期:
Volume 3,
issue 3
页码: 167-179
ISSN:1607-3606
年代: 1979
DOI:10.1080/16073606.1979.9631569
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The doubly infinite diagram of exact sequences that an additive bifunctor T associates with a pair of short exact sequences can be regarded as a web diagram lying on the surface of a cylinder. The diagram has six diagonal sequences involving two graded derived functors that arise through the failure of T to preserve pull-backs respectively push-outs. In the case T = Hom(-,-) one of the diagonal sequences is equivalent to the bivariant Hom-Ext sequence studied by Pressmann [4].
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