Global Existence for Two Dimensional Incompressible Magnetohydrodynamic   Flows with Zero Magnetic Diffusivity
  The existence of global-in-time classical solutions to the Cauchy problem of incompressible Magnetohydrodynamic flows with zero magnetic diffusivity is considered in two dimensions. The linearization of equations is a degenerated parabolic-hyperbolic system. The solution is constructed as a small perturbation of a constant background in critical spaces. The deformation gradient has been introduced to decouple the subtle coupling between the flow and the magnetic field. The $L^1$ dissipation of the velocity is obtained. 
Xianpeng Hu, Fanghua Lin
math.AP