Mathematics of Projections

One Step Further...

Suppose B has rows u1, u2, and u3 , and A has columns v1, v2, and v3 , as before.
What are the entries of the matrix BA ?
The ij -th entry (row i , column j ) is just the dot product of u(i) and v(j) .
If the u s and v s are special, this can have a nice form.

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