Filter convergence in $\beta\omega$
  We give a necessary combinatorial condition on a filter F to admit an injective F-convergent sequence in $\beta\omega$. We also show that no analytic filter F admits an injective F-convergent sequence in $\beta\omega$. This answers a question of T. Banakh, V. Mychaylyuk and L. Zdomskyy. 
Jonathan L. Verner
math.GN