Blow-up of the non-equivariant 2+1 dimensional wave map
  It has been known for a long time that the equivariant 2+1 wave map into the 2-sphere blows up if the initial data are chosen appropriately. Here, we present numerical evidence for the stability of the blow-up phenomenon under explicit violations of equivariance. 
J\"org Frauendiener and Ralf Peter
math-ph math.MP