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Math Help - [SOLVED] Elementary Matrix

  1. #1
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    [SOLVED] Elementary Matrix

    Just double checking...

    Row 3 multiplied by (-1)
    is represented by an identity matrix with I33 = -1, correct?

    and it's inverse is just the identity matrix?
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  2. #2
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    Hello,
    Quote Originally Posted by Noxide View Post
    Just double checking...

    Row 3 multiplied by (-1)
    is represented by an identity matrix with I33 = -1, correct?
    Yes

    and it's inverse is just the identity matrix?
    No, its inverse is itself. Just check the multiplication
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  3. #3
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    Thanks, I though that was the case.

    I know that P32's inverse is P32, but should I even bother writing the -1 superscript?
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  4. #4
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    Quote Originally Posted by Noxide View Post
    Thanks, I though that was the case.

    I know that P32's inverse is P32, but should I even bother writing the -1 superscript?
    You realize, don't you, that no one has any idea what you mean by "P32"?
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  5. #5
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    Oh, I thought it was a convention that Pxy was a permutation matrix.
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