Linear Algebra - How to represent this transformation?

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Homework Help Overview

The problem involves determining the eigenvalues and corresponding eigenvectors of a linear operator T defined on R3, given specific transformations of certain vectors. The challenge lies in representing these transformations as a matrix without an initial matrix provided.

Discussion Character

  • Exploratory, Problem interpretation, Assumption checking

Approaches and Questions Raised

  • Participants discuss how to derive the matrix representation of T by applying it to basis vectors. There are attempts to use linear combinations of known transformations to evaluate T on other vectors. Questions arise regarding the implications of linearity and how to construct the matrix from the provided transformations.

Discussion Status

The discussion is active, with participants exploring different methods to represent the linear operator as a matrix. Some guidance has been offered regarding the use of linear combinations and the application of T to standard basis vectors, but there is no explicit consensus on the best approach yet.

Contextual Notes

Participants are working under the constraint of not having a complete matrix representation initially and are trying to derive it from the transformations provided. The nature of the linear operator and its properties are central to the discussion.

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Homework Statement



Given that T is the linear operator on R3 with T(1,1,1) = (0,0,1), T(1,1,0) = (1,2,1), T(1,0,0) = (0,-1,0), determine the eigenvalues of T and a corresponding eigenvector for each eigenvalue.


Homework Equations





The Attempt at a Solution



I know how to find eigenvalues and vectors but usually the matrix is given.. I'm not sure how to represent these transformations as one whole matrix.. or do I need to do them separately?
 
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You can get the columns of the matrix by applying T to the basis vectors, so you just need to figure out how to calculate T(1,0,0), T(0,1,0), and T(0,0,1) to find the matrix.
 
Okay in that case I can make an augmented matrix with the given relations and row reduce the left side to be the standard basis and the augmented side will be affect of T on the standard basis? Then I can transpose that to get the matrix?
 
Last edited:
If you can find a, b, and c such that

(0,1,0) = a(1,1,1)+b(1,1,0)+c(1,0,0)

then

T(0,1,0)=T[a(1,1,1)+b(1,1,0)+c(1,0,0)]=...

Use T's linearity to evaluate the RHS. Do the same for the vector (0,0,1).
 
I don't really understand.. How can I know what T does just by looking at the vectors that T is applied to..?
 
Like I said, use the fact that T is linear to evaluate the RHS.
 
Okay so for
(0,1,0) a = 0, b= 1, c=-1
(0,0,1) a = 1, b = -1, c = 0
 

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