2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/136871This paper has been withdrawn by the author due to serious flaws in certain proofs. For instance, the method used to construct certain automorphic representations is flawed.This paper has been withdrawnNumber TheoryRepresentation Theory11F70Odd Degree Base Change Lifting for {\rm U}(3)text