The Hopf algebra isomorphism between kappa-Poincare algebra in the case   g^{00}=0 and "null plane" quantum Poincare algebra
  The Hopf algebra isomorphism between kappa-Poincare algebra defined by P.Kosinski and P.Maslanka in the case g^{00}=0 and "null plane" quantum Poincare algebra by A.Ballesteros, F.J.Herranz and M.A.del Olmo is defined. 
Karol Przanowski (University of Lodz, Poland)