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Math Help - matrix sigma notation problems

  1. #1
    Newbie daRitz's Avatar
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    matrix sigma notation problems

    Hi,

    I don't understand sigma notation very well and don't have the first clue how to approach these so any hints would be much appreciated. Sorry about the writing, I use a tablet so I figured it'd be the quickest way to get them up here.





    Thanks in advance
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  2. #2
    MHF Contributor

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    \sum_{i= 1}^4 a_{2i}a_{1i}= a_{21}a_{11}+ a_{22}a_{12}+ a_{23}a_{13}+ a_{24}a_{14}

    \sum_{i=1}^4 a_{i3}\delta_{i4}
    You don't say what " \delta is. If it is intended to mean the identity matrix- then \delta_{i4}= 0 if i\ne 4 while \delta_{44}= 1 so
    \sum_{i=1}^4 a_{i3}\delta_{i4}= a_{43}\delta_{44}= a_{43}
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  3. #3
    Newbie daRitz's Avatar
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    Much appreciated
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