Norm retrieval and phase retrieval by projections
Abstract
We make a detailed study of norm retrieval. We give several classification theorems for norm retrieval and give a large number of examples to go with the theory. One consequence is a new result about Parseval frames: If a Parseval frame is divided into two subsets with spans W1,W2 and W1 W2=\0\, then W1 W2.
0