Dot product explained as matrix multiplication.

[SergiiKashubin]

Hi Francis,
I am not sure where it is best to put it in the doc if at all, but dot product can be easily understood in terms of matrix multiplication: a · b is the same as a^Tb.

This helps while learning linear algebra as one does not need to remember dot product as a separate concept anymore and can easily distinguish it from the outer product ab^T.

You use the same notation for both dot and outer product in the notes, so I think it is worth to mention how you can easily make a distinction this way.

[frnsys]

thank you for bringing this up, I'm clarifying the notation and adding the equivalent matrix multiplications.