Are There Integer Eigenvalues for a Specific Matrix?

In summary, the integer eigenvalues problem is a mathematical problem that involves finding the eigenvalues of a square matrix with integer entries. It has many applications in various fields and is typically solved using algorithms and techniques from linear algebra. However, it poses challenges due to its computational intensity and lack of a general formula for finding eigenvalues. The problem can only be solved for square matrices, but non-square matrices have singular values that serve a similar purpose.
  • #1
cscott
782
1

Homework Statement


I need the eigenvalues of [[3, -1][-1, 1]] (ie [[row1][row2]])

The Attempt at a Solution



A-xI = [[3-x, -1][-1, 1-x]]

so I get the characteristic polynomial x^2-4x+2=0 from det(A-xI)=0

Is this correct? Because I won't get integer eigenvalues from it
 
Last edited:
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  • #2
Yeah, it is right.
 
  • #3
Won't that be really messy to bring the matrix A-xI to RREF? (with x non-integer)
 
  • #4
But in general, there is no reason why things have to be integer...
 
  • #5
Thanks
 
Last edited:

What is the integer eigenvalues problem?

The integer eigenvalues problem is a mathematical problem that involves finding the eigenvalues of a square matrix with integer entries. An eigenvalue is a scalar value that represents how a linear transformation changes when applied to a vector. In the integer eigenvalues problem, the matrix and the eigenvalues must all have integer values.

Why is the integer eigenvalues problem important?

The integer eigenvalues problem has many applications in fields such as physics, engineering, and computer science. It is used to solve systems of linear equations, analyze the behavior of dynamic systems, and understand the stability of complex systems. It is also a fundamental concept in linear algebra, which is widely used in many scientific disciplines.

How is the integer eigenvalues problem solved?

The integer eigenvalues problem is typically solved using algorithms and techniques from linear algebra, such as Gaussian elimination, LU decomposition, and the QR algorithm. These methods involve manipulating the matrix to reduce it to a simpler form, making it easier to find the eigenvalues.

What are some challenges in solving the integer eigenvalues problem?

One of the main challenges in solving the integer eigenvalues problem is that it is a computationally intensive task. As the size of the matrix increases, the number of operations required to find the eigenvalues also increases, making it a time-consuming process. Furthermore, there is no general formula for finding the eigenvalues of a matrix, so different techniques must be used for different types of matrices.

Can the integer eigenvalues problem be solved for non-square matrices?

No, the integer eigenvalues problem is only defined for square matrices, meaning that the number of rows and columns must be equal. Non-square matrices do not have eigenvalues, but they do have singular values, which are similar to eigenvalues but can be computed for any type of matrix.

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