On symmetric sandpiles
  A symmetric version of the well-known SPM model for sandpiles is introduced. We prove that the new model has fixed point dynamics. Although there might be several fixed points, a precise description of the fixed points is given. Moreover, we provide a simple closed formula for counting the number of fixed points originated by initial conditions made of a single column of grains. 
Enrico Formenti (I3S), Beno\^it Masson (I3S), Theophilos Pisokas (I3S)