They’re not the same, but they do correlate (which is why it’s not pointless to define g in the first place); now, due to regression to the mean, someone better at theoretical physics than 99.999999% of the population (and no, I don’t think that’s too many 9s) is likely not also better at general intelligence than 99.999999% of the population—but I very strongly doubt that the correct number of 9s is less than half that many. (Anyway, I’m not sure it’d make sense to define g precisely enough to tell whether someone’s 1 in 10^6 or 1 in 10^9.)
They’re not the same, but they do correlate (which is why it’s not pointless to define g in the first place); now, due to regression to the mean, someone better at theoretical physics than 99.999999% of the population (and no, I don’t think that’s too many 9s) is likely not also better at general intelligence than 99.999999% of the population—but I very strongly doubt that the correct number of 9s is less than half that many. (Anyway, I’m not sure it’d make sense to define g precisely enough to tell whether someone’s 1 in 10^6 or 1 in 10^9.)