An Approximation Problem in Multiplicatively Invariant Spaces

Carlos Cabrelli, Carolina A. Mosquera, Victoria Paternostro

Let $\mathcal{H}$ be Hilbert space and $(\Omega ,\mu )$ a $\sigma$-finite measure space. Multiplicatively invariant (MI) spaces are closed subspaces of $L^2(\Omega ,\mathcal{H})$ that are invariant…