Rank of a Matrix: Determine Value of k

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SUMMARY

The discussion focuses on determining the values of k that result in the matrix (1,1,k),(1,k,1),(k,1,1) achieving ranks of zero, one, two, or three. The participants emphasize the importance of reducing the matrix to row echelon form while considering special cases for k, particularly k=1 and k=-2. It is established that the rank of the matrix is directly influenced by the values of k, necessitating careful analysis of the row operations involved.

PREREQUISITES
  • Understanding of matrix rank and its implications
  • Familiarity with row echelon form and Gaussian elimination
  • Knowledge of special cases in algebraic manipulation
  • Basic concepts of linear algebra
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  • Study the process of reducing matrices to row echelon form
  • Explore the implications of matrix rank in linear transformations
  • Investigate special cases in polynomial equations
  • Learn about determinants and their relationship to matrix rank
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Students studying linear algebra, educators teaching matrix theory, and anyone interested in understanding the rank of matrices and its dependence on variable parameters.

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Homework Statement



Determine the values of k, if any, that give the matrix (1,1,k),(1,k,1),(k,1,1) a rank of: zero, one, two, or three.

Homework Equations





The Attempt at a Solution



I tried reducing to row echelon form but it's confusing dealing with all the k's. Is there a better approach to this?
 
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The row echelon form of this matrix is not very complicated, however it depends on the value of k. So whenever you divide by some value involving k while computing it, you will need to consider special cases (k=1, k=-2).
 

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