cellular balance and particular situations and in a particular sense this was well known a long time ago there's a theorem of car flipping and Meyer from 1980 which says suppose we had extremely efficient circuit now serums like basically perfect sureños arms okay so then there are problems solvable by hours in exponential time say to the end time long enough time that cannot be solved the polynomial size circuit family so this would resolve this X and P poly question we were talking about really okay so just a notation if P equals