Weak Convergence of Greedy Algorithms in Banach Spaces

摘要

We study the convergence of certain greedy algorithms in Banach spaces. We introduce the WN property for Banach spaces and prove that the algorithms converge in the weak topology for general dictionaries in uniformly smooth Banach spaces with the WN property. We show that reflexive spaces with the uniform Opial property have theWN property. We show that our results do not extend to algorithms which employ a 'dictionary dual' greedy step.