Factor posets of frames and dual frames in finite dimensions
  We consider frames in a finite-dimensional Hilbert space where frames are exactly the spanning sets of the vector space. A factor poset of a frame is defined to be a collection of subsets of $I$, the index set of our vectors, ordered by inclusion so that nonempty $J \subseteq I$ is in the factor poset if and only if $\{f_i\}_{i \in J}$ is a tight frame. We first study when a poset $P\subseteq 2^I$ is a factor poset of a frame and then relate the two topics by discussing the connections between the factor posets of frames and their duals. Additionally we discuss duals with regard to $\ell^p$ minimization. 
Kileen Berry, Martin S. Copenhaver, Eric Evert, Yeon Hyang Kim, Troy   Klingler, Sivaram K. Narayan, and Son T. Nghiem
math.FA