Understanding the Eigenvalue Problem for a 4x4 Matrix with Rank 1 and Trace 10

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SUMMARY

The discussion focuses on determining the eigenvalues of a 4x4 matrix A with a rank of 1 and a trace of 10. The trace, defined as the sum of the diagonal elements, directly influences the eigenvalues. Given that the rank is 1, the matrix has one non-zero eigenvalue, which equals the trace, while the remaining three eigenvalues are zero. This leads to the conclusion that the eigenvalues of matrix A are 10, 0, 0, and 0, with a multiplicity of 3 for the eigenvalue 0.

PREREQUISITES
  • Understanding of eigenvalues and eigenvectors
  • Knowledge of matrix rank and its implications
  • Familiarity with the concept of matrix trace
  • Basic linear algebra concepts
NEXT STEPS
  • Study the properties of eigenvalues in relation to matrix rank
  • Learn about the implications of matrix trace on eigenvalue distribution
  • Explore examples of rank-deficient matrices and their eigenvalues
  • Investigate the relationship between eigenvalues and matrix transformations
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Students and professionals in mathematics, particularly those studying linear algebra, as well as anyone involved in computational mathematics or engineering applications requiring matrix analysis.

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Homework Statement



Let there be a 4X4 Matrix A with dim(im(A), or rank = 1 , and trace=10. What are the Eigenvalues of A? Are there any multiplicities?

The Attempt at a Solution



While I understand that the trace of a matrix that's 4X4 = the sum of the diagonal elements, I'm confused about how to create this matrix A to find the eigenvalues, and how to represent the given fact that dim(im(A)) = 1.

Any tips/pointers would be helpful!
 
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You need to review what is meant by the image and dimension of a matrix: what does rank=1 tell you?
Also - do you know of any special cases where the eigenvalues have some simple relation to the trace?
https://www.physicsforums.com/showthread.php?t=682216

Since it is 4x4 - you can always just assign 16 variables and sketch it out.
Needs lots of paper or a large whiteboard (or window).
 
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