Matrix Exponential Homework: Eigenvalues & Eigenvectors

In summary, the conversation discusses showing that if a pair of eigenvalue and eigenvector exist for a matrix A, then multiplying the matrix by e^A equals e^λV. The power series and the use of a fixed point are mentioned as potential approaches to finding a solution. The conversation also briefly touches on the convergence of the power series for matrices and suggests starting with the equation AV = λV to make progress on the problem.
  • #1
BearY
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8

Homework Statement


Show that if ##λ##and ##V ## are a pair of eigenvalue and eigenvector for matrix A, $$e^Av=e^λv$$

Homework Equations


##e^A=\sum\limits_{n=0}^\infty\frac{1}{n!}A^n##

The Attempt at a Solution


I don't know where to start.
 
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  • #2
I'd use a lower case ##v## or better ##\mathbf v## here. (I've never seen capitalized vectors?)
BearY said:

Homework Equations


##e^A=\sum\limits_{n=0}^\infty\frac{1}{n!}A^n##
The power series is quite instructive. Each side is some matrix that is a function of ##A##. What happens if you multliply each side by an eigenvector of A? The idea is there are a lot of moving parts here... if you can find a fixed point maybe it isn't so hard.
- - -
btw, do you know why the series is convergent for matrices? This is a bit subtler of a question.
 
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  • #3
BearY said:

Homework Statement


Show that if ##λ##and ##V ## are a pair of eigenvalue and eigenvector for matrix A, $$e^AV=e^λV$$

Homework Equations


##e^A=\sum\limits_{n=0}^\infty\frac{1}{n!}A^n##

The Attempt at a Solution


I don't know where to start.

Start with ##A V = \lambda V##. What are ##A^2 V##, ##A^3 V##, etc.?
 
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  • #4
Thread locked as the OP has shown no effort.
 

1. What is a matrix exponential?

A matrix exponential is a special type of exponential function that takes a square matrix as its input and outputs another square matrix. It is defined using the Taylor series expansion of the exponential function and has many applications in mathematics, physics, and engineering.

2. How do you calculate the matrix exponential?

The matrix exponential can be calculated using the Taylor series expansion, which involves summing an infinite series of terms. Alternatively, it can be calculated using the eigenvalues and eigenvectors of the matrix, which allows for a simpler and more efficient computation.

3. What are eigenvalues and eigenvectors?

Eigenvalues and eigenvectors are important concepts in linear algebra that are used to study the behavior of linear transformations on vectors. Eigenvalues are scalar values that represent how the transformation stretches or shrinks a vector, while eigenvectors are the corresponding vectors that are only scaled by the transformation.

4. How are eigenvalues and eigenvectors related to the matrix exponential?

The eigenvalues and eigenvectors of a matrix are used to calculate its matrix exponential. Specifically, the matrix exponential of a diagonalizable matrix can be expressed as a diagonal matrix with its eigenvalues as the diagonal entries, while the corresponding eigenvectors form the columns of the matrix.

5. What are the applications of matrix exponential in real-world problems?

Matrix exponential has a wide range of applications in various fields such as physics, engineering, and finance. It is used to solve differential equations, model physical systems, analyze networks, and predict the behavior of complex systems. It also has applications in data compression, image processing, and machine learning algorithms.

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