Hi, I am an undergraduate student of electrical engineering, and I am interested in math of light and pigment color mixing.

Can you please clarify your way of thinking for OR light mixing logic?
It don't make sense to me, because you say that if you put together two of the same colours like (128,0,0) + (128,0,0) you will get (128,0,0), but if you change one of them for smallest possible amount(almost indistinguishable colors) like say for example (128,0,0) + (127,0,0) you get completely different result (255,0,0)
I am not an expert on colors but I don't think it works quite that way in our eye(we don't need perturbations, and chaos theory in this).

I'm interested in colors and i would like to learn this "color math" but I want it to be at least a little more on correct side of reasoning.