I have a question.
I understand the whole +/- thing, but what I don't understand is why it would be more of a defining factor for quadras than traditional quadra values. I tend to see +/- as being the way that quadras differ, not the way they're similar.
For example, Gamma and Delta are similar in that they both valuing Te/Fi. I think that they're more similar than Delta and Alpha are when it comes to rational functions. The +/- is just one explanation for how/why Gamma and Delta differ in some ways when it comes to Te and Fi. They're still more similar )in terms of rational functions) than either is to Alpha or Beta though.