We study the possibility of identifying nonlinear time series using nonparametric estimates of the conditional mean and conditional variance. It is shown that most nonlinear models satisfy the ...

We present a first-order system least-squares (FOSLS) method to approximate the solution to the equations of geometrically nonlinear elasticity in two dimensions. With assumptions of regularity on the ...

Chaotic systems are nonlinear (although technically you could have an infinite-order linear system which would be chaotic), but most nonlinear systems you observe can never be chaotic.