In order for the square of a matrix to be equal to the matrix

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SUMMARY

The discussion centers on the properties of idempotent matrices, specifically those satisfying the equation A² = A. It is established that a matrix A must be square for this equation to hold. The only non-singular idempotent matrix is the identity matrix I, while singular matrices can also be idempotent, provided their diagonal entries are either 0 or 1. The participants explore the implications of singularity and diagonalization in relation to idempotent matrices, concluding that singular idempotent matrices must have at least one zero eigenvalue.

PREREQUISITES
  • Understanding of matrix operations and properties
  • Familiarity with eigenvalues and determinants
  • Knowledge of diagonal and singular matrices
  • Basic proof techniques in linear algebra
NEXT STEPS
  • Study the properties of eigenvalues in relation to singular matrices
  • Learn about similarity transformations and their implications for matrix properties
  • Explore the concept of diagonalization of matrices
  • Investigate further examples of idempotent matrices beyond the identity matrix
USEFUL FOR

Students and professionals in mathematics, particularly those focusing on linear algebra, matrix theory, and proof techniques. This discussion is beneficial for anyone looking to deepen their understanding of idempotent matrices and their properties.

  • #31
Of course.
 
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  • #32
Wow I'm an imbecile. I skipped over that fact and just focused on trying to prove which singular matrices would fit the bill, but this was not required.

Thank you so much for your guidance! I learned more than what the proof expected of me.
 

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