Note on extensions of modules
โ Scribed by F. Loonstra
- Publisher
- Akadmiai Kiad
- Year
- 1975
- Tongue
- English
- Weight
- 312 KB
- Volume
- 26
- Category
- Article
- ISSN
- 1588-2632
No coin nor oath required. For personal study only.
๐ SIMILAR VOLUMES
We derive a cancellation theorem for degenerations of modules that says in particular, that projective or injective common direct summands can always be neglected. Combining the cancellation result with the existence of almost split sequences we characterize the orbit closure of a module living on p
For a given entwining structure A, C involving an algebra A, a coalgebra C, C ลฝ . ลฝ . and an entwining map : C m A ยช A m C, a category M of right A, C -A modules is defined and its structure analysed. In particular, the notion of a หลฝ . ลฝ . measuring of A, C to A, C is introduced, and certain functo