Abstract
Let $G$ be a locally compact group and $H$ a discrete amenable subgroup. We prove the existence of a contractive projection $\mathcal{Q}$ of $CV_p(G)$ onto $CV_p(H)$ such that $\operatorname{supp} \mathcal{Q}(T)\subset \operatorname{supp} T$.
Citation
Antoine Derighetti. "On Herz's projection theorem." Illinois J. Math. 48 (2) 463 - 476, Summer 2004. https://doi.org/10.1215/ijm/1258138392
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