PlanetMath (more info)
 Math for the people, by the people.
Encyclopedia | Requests | Forums | Docs | Wiki | Random | RSS  
Login
create new user
name:
pass:
forget your password?
Main Menu
sections
Encyclopædia
Papers
Books
Expositions

meta
Requests (210)
Orphanage
Unclass'd (1)
Unproven (472)
Corrections (37)
Classification

talkback
Polls
Forums
Feedback
Bug Reports

downloads
Snapshots
PM Book

information
News
Docs
Wiki
ChangeLog
TODO List
Legalese
About
Owner confidence rating: Very low Entry average rating: No information on entry rating
extension (Definition)

A short exact sequence $ 0\to A\to B\to C\to 0$ is sometimes called an extension of $ C$ by $ A$. This term is also applied to an object $ B$ which fits into such an exact sequence.



"extension" is owned by bwebste.
(view preamble)

View style:

Log in to rate this entry.
(view current ratings)

Cross-references: exact sequence, object, short exact sequence
There are 66 references to this entry.

This is version 1 of extension, born on 2003-08-15.
Object id is 4590, canonical name is Extension2.
Accessed 3516 times total.

Classification:
AMS MSC: 20E22 (Group theory and generalizations :: Structure and classification of infinite or finite groups :: Extensions, wreath products, and other compositions)
Pending Errata and Addenda
None.
[ View all 1 ]
Discussion
Style: Expand: Order:
forum policy

No messages.

Interact
post | correct | update request | add derivation | add example | add (any)