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Can someone possibly explain these summations of matrixes to me? I don't understand the notation (specifically the subscripts) and even though I've had it explained to me, I still don't understand.
![Can Someone Possibly Explain These Summations Of Matrixes To Me I Dont Understand The Notation Specifically The Subscripts And Even Though Ive Had It Explained class=](https://us-static.z-dn.net/files/dbe/ef1b6c13b7912ed5f92f8441dca977ed.png)