why is the differenced process weakly stationary why is a complex unit root weakly stationary when a process differs how weakly is it made can an armed process be made stationary how can a complex unit root be made weakly stationary can an arma process be made weakly stationary by differencing? what is the difference between arma and ar(p) what makes a differenced process weakly stationary what makes an arma process weakly stationary which is true of an arma process? why is an arma process weakly stationary what makes a differenced process weakly stationary? why is the difference between a arma process and a bprocess weakly stationary. can a differenced process be weakly stationary if an arma process has unit roots will it weakly be stationary why is the arga process weakly stationary can a arma process be made weakly stationary when differencing? what makes an arma process weakly stationary what makes an arma processes can an arma process be made weakly stationary?