Unitary quasi-lifting: Applications

Let U(3) be the quasi-split unitary group in three variables defined using a quadratic extension E/F of number fields. Complete local and global results are obtained for the (σ-endo-(unstable) lifting from U(2) to GL(3, E). This is used to establish quasi-(endo-)lifting for automorphic forms from U(2) to U(3) by means of base change from ∪(3) to GL(3, E). Base change quasi-lifting is also proven. Continuing the work of [I], the exposition is elementary, and uses only a simple form of an identity of trace formulas, and base change transfer of orbital integrals of spherical functions.