How does one compute the number of ring homomorphisms

  • Context: Graduate 
  • Thread starter Thread starter Treadstone 71
  • Start date Start date
  • Tags Tags
    Homomorphisms Ring
Click For Summary

Discussion Overview

The discussion centers on computing the number of ring homomorphisms from \(\mathbb{Z}_2^n\) to \(\mathbb{Z}_2^m\) and explores the relationship between ring homomorphisms and linear mappings in the context of vector spaces.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant inquires about the method to compute the number of ring homomorphisms from \(\mathbb{Z}_2^n\) to \(\mathbb{Z}_2^m\) and the number of linear mappings between these vector spaces.
  • Another participant suggests a hands-on approach by picking a basis and calculating the mappings manually, indicating that it is straightforward when treated as vector spaces.
  • A different participant questions whether the number of linear transformations between two vector spaces \(V\) and \(W\) is equivalent to the number of group homomorphisms between them, specifically asking if group homomorphisms are necessarily homogeneous.
  • One participant proposes making a conjecture and attempting to prove it, implying a focus on exploration and validation of ideas.

Areas of Agreement / Disagreement

The discussion includes multiple competing views regarding the relationship between ring homomorphisms and linear mappings, as well as the nature of group homomorphisms. No consensus is reached on these points.

Contextual Notes

Participants have not specified assumptions regarding the definitions of homomorphisms or the properties of the vector spaces involved, leaving some aspects unresolved.

Who May Find This Useful

This discussion may be of interest to those studying abstract algebra, linear algebra, or anyone exploring the connections between different algebraic structures.

Treadstone 71
Messages
275
Reaction score
0
How does one compute the number of ring homomorphisms from [tex]\mathbb{Z}_2^n[/tex] to [tex]\mathbb{Z}_2^m[/tex]? Or, likewise, the number of linear mappings on those two vector spaces?
 
Physics news on Phys.org
By doing it. Pick a basis in one and work it out by hand. As vector spaces it's very easy, since it is just a finite set of matrices.
 
When asked the number of linear transformations between two vector spaces V and W, is it the same as asking the number of group homomoprhisms between V and W, of which are homogeneous? Is a group homomorphism automatically honogeneous (preserves scalar multiplication)?
 
make a conjecture and try to prove it.
 

Similar threads

  • · Replies 5 ·
Replies
5
Views
2K
Replies
2
Views
2K
  • · Replies 3 ·
Replies
3
Views
1K
  • · Replies 21 ·
Replies
21
Views
2K
  • · Replies 0 ·
Replies
0
Views
1K
Replies
11
Views
3K
  • · Replies 5 ·
Replies
5
Views
1K
  • · Replies 11 ·
Replies
11
Views
2K
  • · Replies 4 ·
Replies
4
Views
3K
  • · Replies 2 ·
Replies
2
Views
2K