Question: Recall the notation for the sum of the sequence of numbers a1, a2, . . . , an. In this notation, the I, j entry

Recall the notation for the sum of the sequence of numbers a1, a2, . . . , an.
Recall the notation for the sum of the sequence of

In this notation, the I, j entry of the product of G and H is this.

Recall the notation for the sum of the sequence of

Using this notation,
(a) Reprove that matrix multiplication is associative;
(b) Reprove Theorem 2.7.

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