Linear algebra: orthonormal basis

  • Thread starter Felafel
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  • #1
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Homework Statement


##\phi## is an endomorphism in ##\mathbb{E}^3## associated to the matrix
(1 0 0)
(0 2 0) =##M_{\phi}^{B,B}##=
(0 0 3)

where B is the basis: B=((1,1,0),(1,-1,0),(0,0,-1))

Find an orthonormal basis "C" in ##\mathbb{E}^3## formed by eigenvectors of ##\phi##

The Attempt at a Solution



Being the eigenvalues the elements of the diagonal 1, 2, 3
Aren't (1, 0, 0), (0,2,0), (0,0,3) three orthonormal vectors already?

Or should I write the endomorphism according to the canonical basis first and find new values?
 

Answers and Replies

  • #2
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7,496

Homework Statement


##\phi## is an endomorphism in ##\mathbb{E}^3## associated to the matrix
(1 0 0)
(0 2 0) =##M_{\phi}^{B,B}##=
(0 0 3)

where B is the basis: B=((1,1,0),(1,-1,0),(0,0,-1))

Find an orthonormal basis "C" in ##\mathbb{E}^3## formed by eigenvectors of ##\phi##

The Attempt at a Solution



Being the eigenvalues the elements of the diagonal 1, 2, 3
Aren't (1, 0, 0), (0,2,0), (0,0,3) three orthonormal vectors already?
Yes, they are, but these aren't the vectors they're asking for.
Or should I write the endomorphism according to the canonical basis first and find new values?

Use the eigenvalues to find a basis of eigenvectors, and then make an orthonormal basis out of that set of vectors.
 

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