proof the reimann function (if x is rational then f(x)=1/q, if x is irrational

then f(X)=0)is not a step function,and for any essilope, construct a step

function k:[0,1] ~>R s.t. ||f-k||=sup{|f(t)-k(t)|:t is

in[0,1]}<essilope,then show f is regulated