I was well pleased with myself yesterday. I have a long project going to understand one equation, Schroedinger's equation. It is an equation related to potential. So I went to a chapter on electric potential, which lead me to review in a chapter on work (W=Fs or more specifically F dot s). I ended up reviewing in the first chapter on vector notation.
The thing that made me happy was when I saw that I was looking at something called a dot product, the words "as opposed to a cross product" came to mind. I smiled, turned the page, and there it was, the cross product.
I don't remember learning these two the first time. I wonder if I understand them better this time than I did twenty-five years ago. But I was happy that somewhere in the dark recesses of my mind, I remembered something!
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