The bullet problem with discrete speeds
  Bullets are fired, one per second, with independent speeds sampled uniformly from a discrete set. Collisions result in mutual annihilation. We show that the second fastest bullet survives with positive probability, while a slowest bullet does not. This also holds for exponential spacings between firing times, and for certain non-uniform measures that place less probability on the second fastest bullet. Our results provide new insights into a two-sided version of the bullet process known to physicists as ballistic annihilation. 
Brittany Dygert, Christoph Kinzel, Jennifer Zhu, Matthew Junge, Annie   Raymond, and Erik Slivken
math.PR