Approximation by group invariant subspaces

Davide Barbieri, Carlos Cabrelli, Eugenio Hernández +1

In this article we study the structure of $\Gamma$-invariant spaces of $L^2(\mathbf{R})$. Here $\mathbf{R}$ is a second countable LCA group. The invariance is with respect to the action of $\Gamma$, a…