Multiplier Sequences for Simple Sets of Polynomials
  In this paper we give a new characterization of simple sets of polynomials B with the property that the set of B-multiplier sequences contains all Q-multiplier sequence for every simple set Q. We characterize sequences of real numbers which are multiplier sequences for every simple set Q, and obtain some results toward the partitioning of the set of classical multiplier sequences. 
Tam\'as Forg\'acs, James Tipton and Benjamin Wright
math.CV