Is it possible to have a diagonal matrix with all eigenvalues = zero ?

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Homework Help Overview

The discussion revolves around the properties of diagonal matrices and their eigenvalues, specifically focusing on whether a diagonal matrix can have all eigenvalues equal to zero and the implications for linear independence of vectors.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants explore the relationship between eigenvalues and linear independence, questioning whether a matrix with an eigenvalue of zero can still have linearly independent vectors.

Discussion Status

Some participants have provided insights into the nature of the zero matrix and its eigenvalues, while others have clarified the original question's intent. There is an ongoing exploration of the implications of having zero eigenvalues on the independence of vectors.

Contextual Notes

There appears to be a typo in the original question, which has led to some confusion regarding the intended inquiry about eigenvalues and linear independence.

gamerninja213
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Homework Statement




If the only eigenvalue is zero, can you ever get a set of n linearly independent vectors?

Homework Equations





The Attempt at a Solution

 
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In response to the question in the subject, the zero matrix is diagonal and all its eigenvalues are zero.

In response to the question in the problem statement, if even one eigenvalue is zero, then by definition that means Ax = 0 for some nonzero x. Thus the columns of the matrix cannot be linearly independent.
 
The only eigenvalue of the zero matrix is 0. You can certainly find a set of linearly independent eigenvectors. ANY set of linearly independent vectors will do it. Is that all you are asking?
 
The question in the headline statement was a typo sorry.

Thx to answers

Meant to ask the question in the problem statement
 

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