Captain Blackout said:
Qualia is provably NOT expressible mathematically.
I may have misunderstood the point here, but why not?
If qualia is the objective term for subjective impressions of things in the world (at least that's how I understood it, with examples such as "redness"), then we can express the subjective impressions through irregularities and differences between the individuals perceiving things.
Example: A fully red-green blind person would not perceive redness the way I do (I have a red-green weakness) and a person with fully functioning receptors would perceive red different from me as well.
These differences can be expressed through genetic abnormalities as well as the chemical/biological differences in our respective receptors. And those things (especially genetics and chemistry) are pretty mathematical if you ask me.
There are actual physical, comprehensible reasons behind qualia.
Of course, I'll never experience another person's viewpoint first hand but I can understand and express the differences we experience when perceiving the same quale.
EDIT: Oooh, I see I misunderstood indeed.
It's not about the differences between us, it's about trying to describe a quale that's the difficulty. Well, I agree with that, no question about it.
Though I still fail to see how it is relevant.