[Marketa]

I agree that there can be other conscious "things" (another great book about this is Godel, Escher, Bach: An Eternal Golden Braid by Douglas Hofstadter) but I don't think we'll ever have a mathematical proof. How do you want to prove e.g. (the simplest case) YOURSELF mathematically? It's impossible, because mathematics is only a system made by man which power is in connecting and finding relations between various things but which can't prove, I mean REALLY prove, anything - it can't even prove itself.