Direct sum module

From Maths
Jump to: navigation, search
Stub grade: A
This page is a stub
This page is a stub, so it contains little or minimal information and is on a to-do list for being expanded.The message provided is:
Flesh out and document.

Overview

There are two direct sums (categorical coproducts of modules):

  1. External direct sum module - which we shall mean by default
  2. Internal direct sum module - which we shall mean only if explicit.

These are isomorphic[1]

References

  1. Abstract Algebra - Pierre Antoine Grillet