Hey everyone,

I'm struggling with the summation notation for matrices and vector operations, multiplication in particular. Please refer to the image below where I've typed it all out in Word, its too cumbersome here and I want my meaning to be clear:

https://imageshack.us/scaled/large/580/indicesquestion1.jpg [Broken]

I'm struggling with the summation notation for matrices and vector operations, multiplication in particular. Please refer to the image below where I've typed it all out in Word, its too cumbersome here and I want my meaning to be clear:

https://imageshack.us/scaled/large/580/indicesquestion1.jpg [Broken]

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