What math? Are you talking about guessing the 'proper' value of a bitcoin, based upon assumptions of the size of the (non-speculation based) Bitcoin economy? Because it's a rediculous assertion that you, me or anyone can actually know what that is. We can't even get a decent guess without first knowing how much trade goes on within such walled gardens as SilkRoad, OTC or BlackMarket. Just looking at the volume of trade on those currency trading sites like MtGox doesn't tell you anything of usefullness, except that the market price is what the market price says that it is.
Not math specifically. Rather, the logic of my first post in this thread, which yields an equation you can plug numbers into.
I in no way assert that one can know the numbers to plug in with any precision. Rather, I assert that any reasonable guess at the numbers yields a per-bitcoin value orders of magnitude higher than current prices.