Factor posets of frames and dual frames in finite dimensions

Abstract

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 ${\left\{f_i\right\}}_{i\in J}$ 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.