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Find the geometric multiplicity of [tex]\lambda[/tex]=0 as an eigenvalue of the matrix.

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- Thread starter chuy52506
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- #1

- 77

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Find the geometric multiplicity of [tex]\lambda[/tex]=0 as an eigenvalue of the matrix.

- #2

HallsofIvy

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Solve the equation

[tex]\begin{bmatrix}1 & 1 & 1 & 1 & 1 \\1 & 1 & 1 & 1 & 1 \\1 & 1 & 1 & 1 & 1 \\1 & 1 & 1 & 1 & 1 \\1 & 1 & 1 & 1 & 1 \end{bmatrix}\begin{bmatrix} x_1 \\ x_2 \\ x_3 \\ x_4 \\ x_5\end{bmatrix}= \begin{bmatrix}0 \\ 0 \\ 0 \\ 0 \\ 0\end{bmatrix}[/tex].

How many distinct equations do you get relating those variables? Can you solve for some in terms of the others?

- #3

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Here's the text of a http://www.sagenb.org/" [Broken] that answers your question.

Since you've shown no work, I'll leave the interpretation up to you.

Since you've shown no work, I'll leave the interpretation up to you.

Code:

```
sage: A = Matrix(QQ,[[1,1,1,1,1],[1,1,1,1,1],[1,1,1,1,1],[1,1,1,1,1],[1,1,1,1,1]]); A
[1 1 1 1 1]
[1 1 1 1 1]
[1 1 1 1 1]
[1 1 1 1 1]
[1 1 1 1 1]
sage: A.eigenvalues()
[5, 0, 0, 0, 0]
sage: A.eigenspaces()
[
(5, Vector space of degree 5 and dimension 1 over Rational Field
User basis matrix:
[1 1 1 1 1]),
(0, Vector space of degree 5 and dimension 4 over Rational Field
User basis matrix:
[ 1 0 0 0 -1]
[ 0 1 0 0 -1]
[ 0 0 1 0 -1]
[ 0 0 0 1 -1])
]
```

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