Constructing an Isomorphism between Symmetric Matrices and R^3

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In summary, the conversation discusses the process of constructing an isomorphism from a 2 by 2 symmetric matrix to R^3. The individual must choose a general matrix A to test, and make sure that the transformation is one-to-one and onto. The conversation also addresses the need for a suggestion on what the isomorphism actually does, specifically mapping (a,b,c) to a symmetric matrix.
  • #1
retracell
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Homework Statement


Construct an isomorphism from a 2 by 2 symmetric matrix to R^3.

Homework Equations


N/A

The Attempt at a Solution


I know that for a transformation to be an isomorphic, it must be one-to-one and onto. Would the transform be T:A->R^3 and I would have to choose a general matrix A to test?

How would I test it not knowing how the transform is mapped?
 
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  • #2
An isomorphism between which structure?? Vector spaces??

Anyway, given a symmetric matrix

[tex]\left(\begin{array}{cc} a & b\\ b & c \end{array}\right)[/tex]

what element of [itex]\mathbb{R}^3[/itex] would you associate with this matrix??
 
  • #3
micromass said:
An isomorphism between which structure?? Vector spaces??

Anyway, given a symmetric matrix

[tex]\left(\begin{array}{cc} a & b\\ b & c \end{array}\right)[/tex]

what element of [itex]\mathbb{R}^3[/itex] would you associate with this matrix??

Yes vector spaces. What do you mean by what element? Would R^3 simply be some vector v=(v1, v2, v3)?
 
  • #4
retracell said:
Yes vector spaces. What do you mean by what element? Would R^3 simply be some vector v=(v1, v2, v3)?


Yes, elements of [itex]\mathbb{R}^3[/itex] would just be vectors (a,b,c).
 
  • #5
So then I would just check the the nullspace and the dimension of the range? What would be the form of my answer? A matrix?
 
  • #6
You still need a suggestion for what your isomorphism actually does. To which matrix would you map (a,b,c)?? That is: if I give you three real numbers, how would you make a symmetric matrix out of it??
 

FAQ: Constructing an Isomorphism between Symmetric Matrices and R^3

What is an isomorphism?

An isomorphism is a mathematical concept that describes a one-to-one correspondence between two mathematical structures. It essentially means that two structures are identical in their underlying structure, even if their elements may be represented differently.

Why is constructing isomorphisms important?

Constructing isomorphisms is important because it allows us to identify and compare different mathematical structures that may appear different at first glance. By finding isomorphisms, we can establish connections between seemingly unrelated structures and better understand their properties and relationships.

How do you construct an isomorphism between two structures?

To construct an isomorphism between two structures, you need to find a one-to-one mapping between their elements that preserves the structure of the two structures. This means that the mapping must preserve the relationships between elements and operations in both structures.

Can there be multiple isomorphisms between two structures?

Yes, there can be multiple isomorphisms between two structures. In fact, there can be an infinite number of isomorphisms between two structures, as long as they preserve the structure of the two structures.

Are all structures isomorphic to each other?

No, not all structures are isomorphic to each other. In order for two structures to be isomorphic, they must have the same underlying structure and be able to be mapped onto each other in a one-to-one manner. If the structures have different underlying structures, they cannot be isomorphic.

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