On Nilpotency and Asymptotic Nilpotency of Cellular Automata
  We prove a conjecture of P. Guillon and G. Richard by showing that cellular automata that eventually fix all cells to a fixed symbol 0 are nilpotent on S^Z^d for all d. We also briefly discuss nilpotency on other subshifts, and show that weak nilpotency implies nilpotency in all subshifts and all dimensions, since we do not know a published reference for this. 
Ville Salo (University of Turku, Finland)
math.DS cs.FL nlin.CG